Question

in what time will the simple interest on a certain sum be three fourth of a principal at 6percent per annum

Answer 1

12 years 6 months
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Solution Let principal be ₹x
Then SI=₹3/4
SI=P*R*T/100
3/4x=x*6*T/100
T=12.5yrs
That means 12 yrs and 6 months

Answer 2

i think one forth is paid on 3 months three forth in 9 months