Determine the missing amounts in each of these four separate situations a through d. Supplies available prior year-end $ 600 $ 3,180 $ 2,703 Supplies purchased during current year 4,200 10,812 11,412 Total supplies available 4,800 13,992 Supplies available-current year-end (1,050) (3,183) (800) Supplies expense for current year 2,880 21,312 11,987