A person lent Rs. 12,000 to B for 3 years and Rs. 10,000 to C for 4 years on simple interest at the same rate of interest and received Rs. 6,080 in all from both of them as interest. What is the annual rate of interest?

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SSC CHSL Tier-I Exam 2022 Official Paper (Held On: 14 March, 2023 Shift 1)
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  1. 5 percent
  2. 15 percent
  3. 8 percent
  4. 11 percent

Answer (Detailed Solution Below)

Option 3 : 8 percent
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Given:

Principal amount lent to B = Rs. 12,000

Time period for B = 3 years

Principal amount lent to C = Rs. 10,000

Time period for C = 4 years

Total interest received = Rs. 6,080

Formula used:

Simple interest = (Principal amount × Time period × Rate of interest)/100

Solution:

The total interest received is the sum of the interest received from B and the interest received from C.

Interest received from B = (12,000 × 3 × R)/100

Interest received from C = (10,000 × 4 × R)/100

6,080 = (12,000 ×× R)/100 + (10,000 × 4 × R)/100

6,080 = 360R + 400R

6,080 = 760R

R = 6,080 / 760

R = 8%

Therefore, the annual rate of interest is 8%.

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