Pls help and show work!

class A items represent about 77% of the total dollar usage, class B-about 18%, class C-less than 5% (round your responses to the nearest whole number). \begin{tabular}{crrrr|} \hline Item & Annual Demand & Unit Cost & Annual Dollar Volume & Classification \\ \hline A & 170 & $200 & $34,000 & \\ B & 70 & $250 & $17,500 & \\ C & 100 & $16 & \\ D & 100 & $120 & $ \\ E & 30 & $56 & $ \\ \hline \end{tabular}