Question

sum of a money double itself in 7 year in how many years it four times

Answer 1

in 21 yeras it will become four times



let the p=100
so. amount double =200
so. si=100
so. rate =100/7
and at same rate
it will four times
so its amount =400
and then its si=300
and time =21 years
hope this helps you
plz mark as brainlist answer