Use the Case Below to Answer the Following Question(s)

Multiple Choice

Use the case below to answer the following question(s) .
S&N Manufacturing makes four different steel sheets,A,B,C,and D,with different percentages of iron.Each sheet must flow through five departments,forming,rolling,sintering,painting,and quality check.The table below shows the relevant data.Production rates are shown in units/hour.(Sheet A uses imported steel and does not require rolling.) S&N wants to determine the number of steel sheets to produce in order to maximize monthly profit.
Let A,B,C,and D denote the number of units of model A,B,C,and D to be produced,respectively.
-Which of the following is the inequality/equality that describes the time constraint of the forming department?

A) A/50 + B/40 + C/20 + D/20 ≥ 330
B) A/50 + B/40 + C/20 + D/20 ≤ 330
C) A/30 + B/40 + C/20 + D/20 = 330
D) A/50 + B/40 + C/20 + D/20 = 330