A company sells four products: I, II$,$ III, and IV$.$ The company values all inventories using the lowerof sales and expects this rate to hold for the future. Additional information, show margin of $20$ percent for the most recent year as of December $31$

for one unit of Product I?

A$.$ $$90$

B$.$ $$80$

C$.$ $$70$

D$.$ $$60$

$100-10=90$

$100-60=40$