need help with these 2 questions please

Compute the amount to be pad for each of the four separate invoices assuming that all invoices are paid within the discount period. Terms Payment a b. Merchandise (gross) $ 5.400 $ 22.100 $ 77.800 $ 13,500 2/10, 1/80 1/15, 1/90 1/10, 1/30 3/15, 145 C 31 In taking a physical inventory at the end of Year 1, Grant Company forgot to count certain units and understated ending inventory by $12,000. Determine how this error effects each of the following 2. Year 1 cost of goods sold b. Year 1 net income c. Year 2 cost of goods sold d. Year 2 net income