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Saturday, December 22, 2018

A sum of money at simple interest doubles in 7 years. It will become four times in

A sum of money at simple interest doubles in 7 years. It will become four times in
A90 years
B18 years
C38 years
D21 years

Answer is : 21 years

let sum=x, s.i. = x

rate = 100xx7 = 1007%

now,

sum = x, s.i. = 3x, rate = 1007%

time = 1003xx1007%

=>73%

=21 %

Akilesh Kharvi
answered Nov 5 '2016 at 10:48

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