1. 20.2 Credit where credit is due You are trying to decide whether or not to extend credit to a particular customer. Your variable cost is $15 per unit; the selling price is $22. This customer wants to buy 1 000 units today and pay in 30 days. You think there is a 15 per cent chance of default. The required return is 3 per cent per 30 days. Should you extend credit? Assume that this is a one-time sale and that the customer will not buy if credit is not extended.