英文p6 to f1

1.Kimmy has deposited ten year's red pocket money into a bank account.The

simple interest rate is 3% p.a. If the amount will be $ 19620 three years later

, find how much red pocket money she has deposited.

2.Ian has deposited $ 3800 in to the bank and the interest is compounded

half-yearly . If the interest earned after one year's deposite is $ 389.5,find the

compound interest rate per annum.