Revenue
The owner of an orange grove must decide when to pick one variety of oranges. She can sell them for $8 a bushel if she sells them now, with each tree yielding an average of 5 bushels.
The yield increases by half a bushel per week for the next 5 weeks, but the price per bushel decreases by $0.50 per bushel each week.
When should the oranges be picked for maximum return?