A person deposits Rs 12,000 in a savings scheme for 5 years. The scheme offers simple interest at 7% per annum for the first year, 9% per annum for the next 2 years and 11% per annum for the remaining period. Find the total interest earned by the person.

ATQ, Principal = Rs 12,000. For the first 1 year, rate = 7% per annum. Interest for first year = 12000 × 7 × 1/100 Interest for first year = Rs 840. For the next 2 years, rate = 9% per annum. Interest for next 2 years = 12000 × 9 × 2/100 Interest for next 2 years = Rs 2,160. Total period = 5 years. Period beyond 3 years = 5 − 3 = 2 years. For the period beyond 3 years, rate = 11% per annum. Interest for last 2 years = 12000 × 11 × 2/100 Interest for last 2 years = Rs 2,640. Total interest = 840 + 2,160 + 2,640 Total interest = Rs 5,640.