A factory produces blouses at a cost of $\mathrm{R} \$ 2.00$ per unit, in addition to a fixed cost of $R \$ 500.00$. If each unit produced is sold for $\mathrm{R} \$ 2.50$, from how many units produced does the factory start making a profit?
(a) 250
(b) 500
(c) 1000
(d) 1200
(e) 1500
The correct option is (c).

Let $x$ be the number of units produced. Then the production cost is $500+2x$ reais. In the sale, the manufacturer is receiving $2.5x$. Thus, he will have a profit when $2.5x > 500+2x$, that is, $0.5x > 500$, or $x > 1000$.