cat 2021 Question 21

Question

Bank A offers 6% interest rate per annum compounded half yearly. Bank B and Bank C offer simple interest but the annual interest rate offered by Bank C is twice that of Bank B. Raju invests a certain amount in Bank B for a certain period and Rupa invests ₹ 10,000 in Bank C for twice that period. The interest that would accrue to Raju during that period is equal to the interest that would have accrued had he invested the same amount in Bank A for one year. The interest accrued, in INR, to Rupa is

Accepted Answer

Bank A: 6% p.a. 1/2 yearly (CI)

Bank B: x% p.a (SI)

Bank C: 2x% p.a (SI)

Let Raju invest Rs P in bank B for t years. Hence, Rupa invests Rs 10,000 in bank C for 2t years.

Now,

$P \left(\frac{x}{100} ight)t = P\left(1 + \frac{3}{100} ight)^2 - P$

$\left(\frac{x}{100} ight)t = 1.0609 - 1$

$\left(\frac{x}{100} ight)t = 0.0609$

We need to calculate

$ ext{SI} = 10000 imes 2t imes \left(\frac{2x}{100} ight)$

$= 40000 \left(\frac{x}{100} ight) t$

$= 40000 imes 0.0609$

$= 2436$

Question 21.

Question Explanation