a sum of money becomes 5 times of itself at simple interest in 28 years how long would it take for same amount to become double?
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Answer:
t = 7 years
Step-by-step explanation:
Let the sum be x. Time = 28 years ,Amount = 5x, Simple Interest = 5x-x=4x
S.I = P *R*T/100
4x = x*28*R/100
R = 4x *100/28 x
R=100/7 %
Sum = x , R= 100/7%, Interest = x, Time = ?
x = x *t*100/7*100
t= 7 years
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