Answers

2014-05-02T08:30:13+05:30
So time is 15 years
let the principal be A
A(1+r)¹⁵=4A
(1+r)¹⁵=4
 \sqrt[15]{4}=1.0968249796946259606814717780288
so 1+r=1.0968249796946259606814717780288
r=0.0968249796946259606814717780288
so rate percent is 9.68249796946259606814717780288%
0
options r 15, 17.5% , 20% r 25%
well we have to do manually then
I used calculator