using excel need part B, thank you

Also did i do part A correct?

A. If 20 units of the end item are to be assembled, how many additional units of E are needed? \begin{tabular}{ll|c|} B=22010=30 units & E=302=12=48 units \\ C=12010=10 units & E=102=20 units \\ D=32025=35 units & E=352=70 units \end{tabular} A. If 20 units of the end item are to be assembled, how many additional units of E are needed? \begin{tabular}{ll|c|} B=22010=30 units & E=302=12=48 units \\ C=12010=10 units & E=102=20 units \\ D=32025=35 units & E=352=70 units \end{tabular}