Simple Interest — Prelims Questions

A government scheme offers 8% simple interest per annum. If an investor receives ₹2,400 as interest after 3 years, what was the principal amount invested?

Two schemes offer the same principal amount: Scheme A gives 12% simple interest for 2 years, Scheme B gives 8% simple interest for 3 years. If the difference in interest earned is ₹600, what is the principal amount?

A sum of money becomes ₹13,200 in 4 years at 10% simple interest per annum. What will be the simple interest earned on the same sum at 15% per annum for 3 years?

In how many years will a sum of money double itself at 12.5% simple interest per annum?

A person invests ₹5,000 in a government scheme at simple interest. After 2 years, he withdraws ₹1,200 as interest and reinvests the principal in the same scheme. If the total interest after 5 years from the initial investment is ₹3,000, what is the rate of interest?