In the "Let's Go to the Theater" campaign, 5 tickets can be purchased for the usual price of 3 tickets. Mario bought 5 tickets in this campaign. The savings Mario made represent what percentage of the usual price of the tickets?
(a) $20 \%$
(b) $33 \frac{1}{3} \%$
(c) $40 \%$
(d) $60 \%$
(e) $66 \frac{2}{3} \%$
The correct option is (c).

Mário paid 3 and took 5, so he only paid $\frac{3}{5}$ of the usual price, thus saving $\frac{2}{5}$. Since $\frac{2}{5}=\frac{40}{100}$, the savings amount to $40 \%$.