Solving Inequalities for Car Rental: A Step-by-Step Explanation
Assuming 'x' cars of model A are rented, then (12-x) cars of model B are rented. According to the given conditions, we have the following inequalities:
\begin{cases} 50x+40(12-x) \geqslant 520 \ 15x+25(12-x) \geqslant 240 \ \end{cases}
Therefore, the correct set of inequalities is:
\begin{cases} 50x+40(12-x) \geqslant 520 \ 15x+25(12-x) \geqslant 240 \ \end{cases}
Hence, the answer is A.
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