-
At a certain rate of simple interest, a certain sum of money becomes double of itself in 10 years. It will become treble of itself in
-
- 15 years
- 18 years
- 20 years
- 30 years
- 15 years
Correct Option: C
If principal be p , interest = p and rate = r% p.a. then
| Rate = | |
| Principal × Time |
| Rate = | = 10% | |
| p × 10 |
Now, Principal = p, interest = 2p
| Then, time = | |
| Principal × Rate |
| time = | = 20 year | |
| p × 10 |
Second method to solve this question :
| R = | × 100% | |
| 10 |
R = 10%
| T = | × 100 years. | |
| R |
| T = | × 100 years. | |
| 100 |
T = 20 years.
