Raj invested an amount of Rs.17400 for two years. Find the rate of compound interest that will fetch him an amount of Rs.1783.50 at the end of two years?
Answer: D
Let the rate of interest be R% p.a.
17400[1 + R/100]⊃2; = 17400 + 1783.50
[1 + R/100]⊃2; = (17400 + 1783.50)/17400
= 1 + 1025/10000 = 1 + 41/400
= 441/400 = [21/20]⊃2;
[1 + R/100] = 21/20
R/100 = 1/20
Therefore R = 5