If you could possibly show me what math you do to get the correct answers, I've been stuck on what to substract and add to get certain numbers. Thanks!

Exercise 6-4 Calculate inventory amounts when costs are rising (L03) [The following information applies to the questions displayed below.] During 2015, TRC Corporation has the following inventory transactions. Unit Number of Units Transaction Date Jan. 1 Jul. 16 Oct. 6 Beginning inventory Purchase Purchase Purchase 51 131 201 Cost Total Cost $43 2,193 5,895 9,648 5,439 45 48 49 7 494 $ 23,175 For the entire year, the company sells 431 units of inventory for $61 each. References Section Break Exercise 6-4 Calculate inventory amounts when costs are rising (LO3)