Suppose the newsboy buys newspapers from his supplier for $0.25 per copy, and sell to customers for $0.75 per copy. For the unsold papers (if any), the boy would return to his supplier for credit of $0.05 per copy. If the demand of the news paper is uniformly distributed from 50 to 100 (including 50 and 100), and the possible order sizes are 50, 60, 70, 80, 90, or 100, please help the newsboy to decide