Assume that you deposited 40,170.00 bahts on 30/05/02 and you found that the balance turned to be 40,421.06 bahts on 30/08/02. Answer the following questions.
a) What was the interest?
b) What was the interest rate per quarter?
c) What was the interest rate posting on 30/05/02?
d) What was the effective interest rate?
e) What should be the balance on 30/05/03?