At the beginning of the current season on April 1, the records of Bramble Pro Shop showed Cash $ 2,840, Inventory $ 3,500, and Common Stock $ 6,340. The following transactions occurred during April 2022.

Apr. 5		Purchased golf bags, clubs, and balls on account from Cullumber Co. $ 1,500.
9		Received credit from Cullumber Co. for merchandise returned $ 600.
10		Sold merchandise on account to members $ 1,470. The merchandise sold had a cost of $ 740.
12		Purchased golf shoes, sweaters, and other accessories on account from Ivanhoe Sportswear $ 1,050.
14		Paid Cullumber Co. in full.
17		Received credit from Ivanhoe Sportswear for merchandise returned $ 50.
20		Made sales on account to members $ 900. The cost of merchandise sold was $ 550.
21		Paid Ivanhoe Sportswear in full.
30		Received payments on account from members $ 1,180.

I am having trouble getting the 14th and the 21st. The terms are 2/10 and n/30. I think for this question its just 2/10. If someone could explain how to get the answer it would be greatly appreciated.