Question

Question 20. The simple interest on a certain sum at 5% per annum for 3 years and 4 years differ by 82. Find the sum.
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Answer 1

Answer:

Simple Interest=

100

PTR

Simple Interest for 3 years=

100

P×3×5

Simple Interest for 4 years=

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