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At what rate per cent per annum will the simple interest on a sum of money be 2/5 of the amount in 10 years ?
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- 4%
- 6%
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5 2 % 3 -
6 2 % 3
- 4%
Correct Option: D
Here , T = 10 years
According to question ,
Let P be the principal and R% rate of interest.
| ∴ SI = | = | ||
| 100 | 10 |
According to the question,
| = |  | P + |  | × | |||
| 10 | 10 | 5 |
| ⇒ | = | | 1 + | | × | |||
| 10 | 10 | 5 |
| ⇒ | = | + | |||
| 10 | 5 | 25 |
| ⇒ | - | = | |||
| 10 | 25 | 5 |
| ⇒ | = | ||
| 50 | 25 |
| ⇒ | = | ||
| 50 | 5 |
| ⇒ R = | = | = 6 | % | |||
| 3 × 5 | 3 | 3 |
