At the beginning of July, CD City has a balance in inventory of $3,350. The following transactions occur during the month of July.

July 3	Purchase CDs on account from Wholesale Music for $2,250, terms 2/10, n/30.
July 4	Pay freight charges related to the July 3 purchase from Wholesale Music, $100.
July 9	Return incorrectly ordered CDs to Wholesale Music and receive credit, $200.
July 11	Pay Wholesale Music in full.
July 12	Sell CDs to customers on account, $5,700, that had a cost of $2,950.
July 15	Receive full payment from customers related to the sale on July 12.
July 18	Purchase CDs on account from Music Supply for $3,050, terms 2/10, n/30.
July 22	Sell CDs to customers for cash, $4,150, that had a cost of $2,450.
July 28	Return CDs to Music Supply and receive credit of $290.
July 30	Pay Music Supply in full.

How we can answer this kind of question explain please