Question

6.
The principal. at a certain rate of interest, doubles in 5 years by the
simple interest. In how many years, the same principal with the same
rate of interest becomes five times?
1
(1) 10 years
12 years
(3) 20 years
(4) 25 years
2
of 7 n.c.p.a. How much​

Answer 1

Answer:

20 years.

Step-by-step explanation:

Let the principal be 100

It doubles in 5 years inetrest . It means we received rs. 100 as interest. So interest rate is 100/5=20%.

When the principal becomes 5 times it means interest earned is 400

Number of years required=400/20=20