What is the rate of simple interest ? I. The total interest earned was ` 4000. II. The sum was invested for 4 years.
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.
Explanation
We know that, $R=\left(\frac{100 \times \text{S.I.}}{P \times T}\right)$. Now, I. gives, S.I. = ₹4000. But, $P$ is unknown. So, we cannot find $R$. So, given data is insufficient to get $R$. ∴ Correct answer is (d).
Explanation as extracted from the printed page; notation may be imperfect.