We have to model the profit for his business.
The fixed cost is $3000.
The variable cost is $8 per hat and the price is $20 per hat.
Let x be the number of hats sold, then we can model the profit y as:
We have to calculate the number of hats x for a profit y = 1200.
We can do it as:
Answer: to make a profit of $1200 he needs to sell 350 hats.