May I ask for an explanation to the question. Thank you!

If purchases were made under terms of (a) trade discount of 20%, (b) credit terms of 2/10, n/30, and (c) shipping terms of FOB shipping point, freight collect, which of the following sentences are FALSE?

a. If the entity paid on the tenth day, it would only pay 98% of the invoice price.

b. The invoice price is only 80% of the list price.

c. If the entity uses the perpetual inventory method, shipping cost would be recorded as a debit to Freight-in and a credit to cash.

d. The entity will pay for its freight-in on the purchase.