Final answer:
The cost to substitute the charro beans on all items of the tex-mex menu varies and can be obtained by contacting the restaurant directly.
Step-by-step explanation:
The cost to substitute the charro beans on all items of the tex-mex menu would depend on the specific price set by the restaurant or establishment. Without knowing the exact pricing, it is difficult to determine the specific cost. However, you can inquire with the restaurant directly to get an accurate answer.