The following data represent the beginning inventory and, in order of occurrence, the purchases and sales of Petroni, Inc. for an operating period.

$\backslash$table$[[,$Units,Unit Cost,Total Cost,Units Sold$],[$Beginning Inventory,$50,$$$124,$$$6,200,],[$Sale No$.1,,,,40],[$Purchase No$.1,30,100,3,000,],[$Sale No$.2,,,,32],[$Purchase No$.2,{40}_{?},88,3_{,}{520}_{?},-],[$Totals$,{120}_{{?}_{?}},,$$$12,{720}_{?},{72}_{{?}_{?}}$