need help with this

5. Hanan saves RM3000 now and another RM1000 after 3 years in an account paying 12% compounded quarterly. Find (a) the amount and (b) the total interest in the account at the end of five years from now. (5 Marks) 6. A retailer purchases 500 boxes of pears at RM8 per box. Experience indicates that about 4% of these boxes will be spoilt and have to be discarded. The retailer then sets the selling price, taking into account a net profit of 30% on cost. The operating expenses incurred are 9% of the cost. Calculate the selling price of the pears. (4 Marks)