Question : Sum INR 20,000 and INR 40,000 are given on simple interest at the rate of 10% and 15% per annum respectively for three years. What will be the total simple interest?
Option 1: INR 36,000
Option 2: INR 24,000
Option 3: INR 32,000
Option 4: INR 28,000
Correct Answer: INR 24,000
Solution :
Given: Sum INR 20,000 and INR 40,000 are given on simple interest at the rate of 10 percent and 15 percent per annum respectively for three years.
We know the formula, $SI=\frac{P\times R\times T}{100}$ where $SI$, $P$, $R$, and $T$ are the simple interest, principal, rate, and time.
SI for the rate of 10% is,
⇒ $SI=\frac{20000\times10\times3}{100}=$ INR 6,000
SI for the rate of 15% is,
⇒ $SI=\frac{40000\times15\times3}{100}=$ INR 18,000
The total simple interest = INR 6,000 + INR 18,000 = INR 24,000.
Hence, the correct answer is INR 24,000.
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