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

$\backslash$table$[[,$a$,$b$,$c$,$d$],[$Supplies available $-$ prior year$-$end,$$,225,$$$,1,193,$$$,1,014],[$Supplies purchased during current year,,$1,575,,4,056,,,4,656],[$Total supplies available,,$1,800,,5,249,,,],[$Supplies available$-$current year$-$end,,$(675),,,,(1,494),(800)$