Please help me

QUESTION 1a

Ahmad invested RM5,000 in an investment scheme on 18th October 2018. The investment offered a simple interest rate of 5.25% per annum. By using approximate time and exact simple interest, find the total interest received on 21st December 2018.

QUESTION 1b

RM4,500 was borrowed for 40 weeks at a discount rate of 8.75%. Determine the amount received and the simple interest rate that is equivalent to the given discount rate

QUESTION 1c

RM P was invested in a bank for 5 years 4 months. If the interest rate offered was 4.5% compounded every two months and the accumulated amount at the end of the investment period is RM19,369.20, find the value of P and the interest earned