At what rate percent of simple interest per annum will a sum of money earn interest equal to 3/5 of the principal in 4 years
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Maths
At what rate percent per annum will the simple interest on a sum of money be
5
2
of the amount in 10 yrs.
Answer
Correct option is
D
3
20
%
Let the principal be x , time =10 years , Rate=r% per annum
⇒
100
x×r××10
=
5
2
x+
100
x×r×10
⇒
10
xr
=
5
2x
+
50
2xr
⇒
10
xr
−
50
2xr
=
5
2x
⇒r=
3
2×10
=
3
20
%
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