Please provide all workings in a clear and understandable manner

Question 1 (A) In response to customer complaints about rising prices of food items, a supermarket responds by making the following offer: For every $10 of purchase, the customers will earn $1 worth of coupons and this way they will end up making twice as much as the supermarket. If the supermarket makes $500 worth of total sales to all customers taken together, how much will it need to restrict its costs to so as to honour the offer? Question 1 (B) Use the following information to answer the question that follow: NetIncomeProfitmarginA/RCreditsalesComputethedayssalesinreceivables:$205,000:7.80%:$151,642:60%oftotalsales