Question

In how many years will a certain sum become 3 times itself at 25% per annum under simple interest? (a) 5  (b) 8 (c) 12 (d) 6

Answer 1

Principal amount be P.
Amount= principal amount+simple interest
3P=P +simple interest
=>simple interest=2P
=>`2P=(P xx R xx T)/100` given R=25%
=>`2 xx 4=8 yrs=T`