please solve all subparts or leave it for someone else . thank you for your understanding

Chuck's Chops, an up-scale steak house, received an invoice for 800 pounds of baking potatoes with a cost of $.85 per pound. The terms were 2 1/2/10, N/30. Chuck was unable to pay the bill in full within the discount period but was able to remit a partial payment of $425.00 within the discount period. How much credit did Chuck receive for his payment? Widgets Inc. received an invoice from a supplier for raw materials that had a list price of $12, 600.00. The supplier offered a series discount of 30/20/10 and terms of 2/10, N/30. The supplier paid the freight. The invoice was dated June 10 and the goods were received on June 30. If Widgets remitted full payment on July 10, what was the amount they paid? Matthew Cone is a salesman for Ace Leasing. He earns a salary of $800 per month, plus a commission of 5 1/2 % on all sales over $10, 000. If Matthew sold $28, 260 last month, what was his total gross pay (before taxes)? Shaffer's Book Store borrowed $30, 000 on March 10 for 90 days. The interest rate was 9% using the ordinary interest method. On day 30 of the loan, Shaffer made a partial payment of $12, 000, and on day 70 of the loan Shaffer made a second partial payment of $3, 000. What is the new maturity value of the loan (final amount due)? John wants to set aside $100, 000 for his daughter's wedding when she turns 21 years of age. She is 11 years old today. If he can earn 6% compounded semi-annually on his money, how much money must he set aside today to have enough for the wedding day