Reconsider Problem 30. [Cowboy Construction buys materials on account from Highes. Highes offers a 2 percent discount for invoices paid within 10 days. Full payment is due within 90 days. Cowboy Construction routinely pays its invoices on the ninetieth day. If Cowboy's effective tax rate is 42 percent, what is the cost of capital for accounts payable?] Repeat Problem 30 assuming that Highes has changed its invoice terms such that full payment is due within 60 days. 8.6 Cost: Carry all interim calculations to 5 decimal places and then round your final answer to 1 decimal place. The tolerance is 0.2