Question

if the simple interest on a certain sum of money at 5% per annumn for 4years and 3years differ by 42,the sum is?​

Answer 1

ANSWER

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