At the SUPER-SUPER store clearance, all products are $50\%$ cheaper, and on Saturdays there is an additional $20\%$ discount. Carla bought a pair of pants before the clearance, and now she laments: On this Saturday, I would have saved $R \$ 50.40$ on the pants. What was the price of the pants before the clearance?
During the sale, except on Saturdays, the prices are $50 \%$ of the original prices. On Saturdays, with an additional $20 \%$ discount, the prices are $80 \%$ of the prices outside of Saturdays, that is

$$
80 \% \text { of } 50 \%=\frac{80}{100} \times \frac{50}{100}=\frac{40}{100}=40 \% \text { of the price outside the sale. }
$$

Therefore, Roberta missed out on saving $60 \%$, which corresponds to R\$ 50.40. We have:

$$
\begin{array}{ll}
60 \% & \Rightarrow 50.40 \\
10 \% & \Rightarrow 50.40 \div 6=8.4 \\
100 \% & \Rightarrow 8.4 \times 10=84
\end{array}
$$

The price of the pants before the sale was R\$ 84.00.