Question

in how many years will a certain sum become 3 time itself at 20 percent per annum under simple interest​

Answer 1

Answer:

Let n be the number of years in which principal P becomes 3P

Interest grown during n years = I=P(20/100)n=P×n/5

It is given P+I = 3P

P+P×n/5=3P

P×n/5=2P

n/5=2

n=5×2=10 years