Determine the missing amounts in each of these four separate situations a through d. a b C Supplies available-prior year-end $ 300 $ 1,590 $ 1,352 Supplies purchased during current year 2,100 5,406 6,006 Total supplies available 2,400 6,996 Supplies available-current year-end (750) (1,832) (800) Supplies expense for current year 1,290 9,546 6,581