How to solve

Use the information below to determine the sales revenue, cost of goods sold and gross profit that would be reported for the company related to the March $16$ sale assuming the company uses weighted average inventory valuation and a perpetual inventory system. Show all your work, but you do not need to create a table for this question. $4$ points

$\backslash$table$[[$January $1$:$,$Purchased $100$ units at $$10$ per unit.$],[$February $5$:$,$Purchased $60$ units at $$12$ per unit.$],[$March $16$:$,$Sold $40$ units for $$16$ per unit.$]]$