Question

19. : In how many time will a
sum become four times of
itself at the rate of 15% per
annum.
O a) 20 years
O b) 30 years
O c) 40 years
O d) 50 years​

Answer 1

Answer:

20 years .

But approx 20 years not confirm

Answer 2

Answer:

Approximately 30 years

Step-by-step explanation:

15% of the sum is completed in 1 year

1% of the sum is completed in 1/15 year

400% of the sum is completed in = 1/15×400 years

10

= 26 ___ years

15