please answer this question !

1. You are currently re-evaluating your payables policy. Your current supplier o'ers terms of 1.510, net 40 with a late payment fee of 1.5% per month. A supplier wanting your business is willing to olfer terms of 2.515, net 60 with no stated late payment fee. Your annual borrowing rate is 18%. Assume a 365-day year. a. How long should you delay payment given the terms of your current supplier? Prove your answer by relating the annualized cost of the discount to your investment or borrowing rate. b. How long should you delay payment given the terms of the competing supplier? Prove your answer by relating the annualized cost of the discount to your investment or borrowing rate. c. Based on an average invoice of $100,000, which supplier should you purchase 'orn, i.e., which set of terms results in the minimum net present-value cost