JAMB - Mathematics (2010 - No. 24)
At what rate will the interest on N400 increases to N24 in 3 years reckoning in simple interest?
3%
2%
5%
4%
Explicaţie
Using simple interest = \(\frac{P \times T \times R}{100}\),
where: P denoted principal = N400
T denotes time = 3 years
R denotes interest rate = ?
24 = \(\frac{400 \times 3 \times R}{100}\)
24 x 100 = 400 x 3 x R
R = \(\frac{24 \times 100}{400 \times3}\)
= 2%
where: P denoted principal = N400
T denotes time = 3 years
R denotes interest rate = ?
24 = \(\frac{400 \times 3 \times R}{100}\)
24 x 100 = 400 x 3 x R
R = \(\frac{24 \times 100}{400 \times3}\)
= 2%