A factory produces blouses at a cost of $R \$ 2.00$ per unit in addition to a fixed cost of $R \$ 500.00$. If each unit produced is sold for $R \$ 2.50$, from how many units produced does the factory start making a profit?
(a) 250
(b) 500
(c) 1000
(d) 1200
(e) 1500
Let's denote by $x$ the number of units produced. Thus, the production cost is $500+2 x$ reais. From the sales, the manufacturer is receiving $2.5 x$. Therefore, he will have a profit when

$$
2.5 x > 500 + 2 x
$$

that is, $0.5 x > 500$. Therefore, $x > 1000$. Hence, the correct option is (c).