Determine the missing amounts in each of these four separate situations a through d.

Determine the missing amounts in each of these four separate situations a through d. Explanation: Proof:    (a) (b) (c) (d)   Supplies available − prior year-end $ 400   $ 1,200   $ 1,260   $ 2,288     Supplies purchased in current year 2,800   6,500   8,490   3,000     Total supplies available 3,200   7,700   9,750   5,288     Supplies available − current year-end (650)  (6,500)  (1,350)  (700)    Supplies expense for current year $ 2,550   $ 1,200   $ 8,400   $ 4,588