Mathematics for IGCSE & O level - Percentages (Section 6)
1
What is the formula for compound interest?
Trả lời
(A)
A = P(1 + r/100)^n
2
Due to inflation, prices increase by 5% per year. An item costs $12 now. What will it cost in 2 years' time?
Trả lời
(B)
$13.23
3
What percentage is 150 of 200?
Trả lời
(B)
75%
4
What is the definition of inflation?
Trả lời
(B)
An increase in the general level of prices
5
What is 2.4% of 5000?
Trả lời
(B)
120
6
Andrew invested $3500 in a six-year bond that paid 5% compound interest for the first three years and 7.5% compound interest for the next three years. What is the amount in the bond, to the nearest cent after six years?
Trả lời
(B)
$4907.97
7
Andrew invested $3500 in a six-year bond that paid 5% compound interest for the first three years and 7.5% compound interest for the next three years. What is the amount in the bond, to the nearest cent after three years?
Trả lời
(B)
$4043.63
8
A trader buys an item for $12.50 and sells it at a loss for $5. What is his percentage loss?
Trả lời
(C)
64%
9
Selena invests $4000 and receives 5% interest a year which is added to the amount each year. What is her investment worth in total after 6 years?
Trả lời
(B)
$5360.38
10
Decrease $500 by each of these percentages:
a) 5%
b) 10%
Trả lời
(B)
$475, $450
11
A shop increases prices by 5% and then by another 5%. What is the overall percentage increase (to nearest whole %)?
Trả lời
(A)
9%
12
If the price of an item increases by 7% one year and then decreases by 7% the following year, what is the overall percentage change?
Trả lời
(C)
-0.49%
13
Pulova has high inflation. A car cost 78000 dubs (their unit of currency) in January 2023. In January 2024? Prices increased by 15% a month for the first six months and 12.5% for the next six months in 2023. What will it cost in January 2024?
Trả lời
(C)
$199300
14
Increase $400 by each of these percentages:
a) 1%
b) 5%
Trả lời
(A)
$404, $420
15
Which of these is equivalent to 0.75 as a percentage?
Trả lời
(B)
75%
16
A shopkeeper buys an article for $22 and sells it for $27. What is his percentage profit?
Trả lời
(D)
22.5%
17
What does the 'P' represent in the compound interest formula?
Trả lời
(A)
Principal
18
Françoise buys a car for $9500 and sells it a year later for $8300. What is her percentage loss?
Trả lời
(A)
12.6%
19
A shop increases the price by 9%.
What is the sale price of a article previously was $300
Trả lời
(A)
327
20
In a class of 25 students, 10 are girls. What percentage are girls?
Trả lời
(C)
40%
21
If a car costs 78000 dubs in January 2023, and prices increase by 15% per month, what does it cost after one month?
Trả lời
(A)
89700
22
Mr. Costa was given an 8% pay rise every year. His starting salary was $28,500. How much does he earn after four rises?
Trả lời
(B)
$38786.20
23
A shopkeeper buys an article for $10 and sells it for $12.
What percentage profit does the maker make?
Trả lời
(B)
20%
24
What is the multiplier used to increase a quantity by 7%?
Trả lời
(A)
1.07
25
What is the multiplier to decrease by 15%?
Trả lời
(B)
0.85
26
A shopkeeper buys potatoes at $1.40 per kilogram and sells them for $1.80 per kilogram. What is his percentage profit?
Trả lời
(A)
28.6%
27
How do you calculate the loss percentage?
Trả lời
(D)
(Cost Price - Selling Price) / Cost Price * 100
28
What is 10% of $6.80?
Trả lời
(A)
$0.68
29
What is the simple interest of $1000 at 5% for 2 years?
Trả lời
(B)
$100
30
Find 50% of $680.
Trả lời
(A)
$340
31
What is the multiplier when increasing by 10%
Trả lời
(B)
1.1
32
What is 0.5% of $8.60?
Trả lời
(D)
$0.043
33
Which statements about Jerry's annual salary of $48000 are correct?
(a) Jerry's monthly gross pay = $4000. (b) If Jerry's commission for the sales = $7500, then in May he will receive $5750. (c) Total pay for May = $5750.
Trả lời
A
B
34
What information is needed to find the value of an investment after a certain time, when using the compound interest formula?
Trả lời
A
B
C
35
What is the value of the investment after four years if $1500 is invested in an account that earns compound interest of 4% annually?
Trả lời
(A)
$1747.34
36
Steve's wage is $195 per week. How much does he earn in a year?
Trả lời
(C)
$9,360
37
Salim has $4000 to invest for 5 years. He has two options: 3.5% simple interest or 3.25% compound interest. Which is the better option?
Trả lời
(A)
3.5% simple interest
38
What term is given to the original amount of money invested?
Trả lời
(A)
Principal
39
How do you calculate the profit percentage?
Trả lời
(C)
(Selling Price - Cost Price) / Cost Price * 100
40
Express 10 in a percentage of 100.
Trả lời
(B)
10%
41
What is 2.5% of $400?
Trả lời
(A)
$10
42
Find the original quantity if a quantity is decreased by 5% and it is now $90.
Trả lời
(A)
$94.74
43
If an item increases in value by 10% one year and then decreases by 10% the next year, what is the final change as a percentage?
Trả lời
(C)
-1%
44
Express 4 as a percentage of 5.
Trả lời
(D)
80%
45
What is 5% of $100?
Trả lời
(B)
$5
46
A shop increases the price by 9%.
What is the sale price of a article previously was $300?
Trả lời
(C)
$327
47
What will be the value of Martin's shares after 10 years if he had shares worth $8000 and they increased in value by 7.5% each year?
Trả lời
(D)
$16197
48
Which type of interest is added to the original amount each year?
Trả lời
(B)
Compound Interest
49
What does the 'A' represent in the compound interest formula, A = P(1 + r/100)^n?
Trả lời
(C)
Final Amount
50
A pair of shoes are marked down by 15%. If the original price was $80, what is the sale price?
