Mathematics for IGCSE & O level - Percentages (Section 6 - No. 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?
0%
1.07%
-0.49%
-7%
설명
Let the original price be 100. After a 7% increase, the price becomes 107. A 7% decrease of 107 is 107 * 0.07 = 7.49. The new price is 107 - 7.49 = 99.51. The overall change is -0.49%.