This is very straight foward . . . Exactly where is your difficulty?
Costs associated with manufacturing x products is described by:
Revenue for this level of manufacturing is: .
1. Expression for profit associated with manufacturing items
They told us that: . . . . didn't they?
2. How many items should be manufactured to minimise production costs?
We want to minimize
3. How many items need to be manufactured to maximise the profit?
We want to maximize