if the simple interest on a certain sum of money at 5% per annumn for 4years and 3years differ by 42,the sum is?
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Simple Interest=
100
PTR
Simple Interest for 3years=
100
P×3×5
Simple Interest for 4years=
100
P×4×5
Given:Simple Interest for 4years−Simple Interest for 3=Rs.42
⇒
100
P×4×5
−
100
P×3×5
=42
⇒
100
20P
−
100
15P
=42
⇒5P=4200 or P=
5
4200
=Rs.840
∴sum=Rs.840
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