9. The following invoice below was paid on April 2. Find (a) the invoice total, (b) the amount that should be paid lafter the cash discount, and (c) the total amount due, including shipping and insurance. CALCULATOR PLUS WHOLESALER Terms: 5/10, 3/15, 1/20 March 21 Quantity Description Unit Price Extension Total 25 25 20 Scientific calculator @ 17.45 ea. Graphing calculator @ 75.92 ea. Financial calculator @ 21.90 ea. (a) Invoice Total Cash Discount (b) Due after Cash Discount $83.15 Shipping and Insurance (c) Total Amount Due