Can someone help verify thqt my calculations are correct, and if not give the toght andwer. Also, can someone help me with the last problem

Exercise 10-11 Pina Engineering Corporation purchased conveyor equipment with a list price of $9,000. Presented below are three independent cases related to the equipment. (a) Pina paid cash for the equipment 8 days after the purchase. The vendor's credit terms are 2/10, 1/30. Assume that equipment purchases are intely recorded gross. (b) Pina traded in equipment with a book value of $2.000 (initial cost $8,100), and paid $3,500 in cash one month after the purchase. The old equipment could have been sold for $400 at the date of trade. (The exchange has commercial substance.) (c) Pina gave the vendor a $9,800 zero-interest-bearing note for the equipment on the date of purchase. The note was due in one year and was paid on time. Assume that the effective interest rate in the market was 10% required, select No Entry for the account titles and enter o for the amounts.) No. Account Titles and Explanation Debit Credit (a) Equipment 9800 Accounts Payable 9800 (To record the purchase of equipment on account.) Accounts Payable 9800 Cash 9604 196 Equipment (To record the payment on account.) (b) Equipment (New) 8900 Loss on Disposal of Equipment 1600