Answer :
[tex]\begin{gathered} \text{ Since we have to spend less that \$10} \\ 0.25C+0.20M<10.00 \\ \\ \text{ Since she want to buy at least 50,} \\ C+M\ge50 \\ \\ \text{ The answer is } \\ 0.25C+0.20M<10.00 \\ C+M\ge50| \end{gathered}[/tex]