What is the simple interest on a sum of Rs 30000 borrowed for 2 years at 5% p.a.?

What is the amount to be paid at the end of 10 years on a sum of Rs 25000 borrowed at 8% p.a.?

Rs 5000 was invested at 5% simple interest for ‘n’ years. How much more money should be invested at 12% simple interest for ‘n’ years so that the overall interest to be paid is at 10% p.a. for ‘n’ years?

Mr.Nair's monthly salary is rs 22,500. He took a loan of rs 30,000 on simple interest for 3 years at the rate of 5 p.c.p.a. The amount that he will be paying as simple interest in 3 years is what percent of his monthly salary ?

What is the difference between the compound interest and simple interest accrued on amount of Rs. 16200 at the end of three years @ 25% ? (rounded off to two digits after decimal)