Determine the missing amounts in each of these four separate situations a through d. a b c d Supplies available-prior year-end $ 475 $ 2,518 $ 2,140 $ Supplies purchased during the current year 3,325 8,561 9,161 Supplies available-current year-end 925 2,620 800 Supplies expense for the current year 2,218 16,413 9,736?