Hi, I have a question for which the answer is provided but I don't know how it is derived, could you help to explain it step by step please? Why is the answer 100? Thank you in advance!

In Baggs, Wyoming, cattle can be produced according to the following process: C = = G/10 + P/40, where C is the number of cattle, G are bushels of grain, and P are acres of pasture. If grain costs $4 per bushel and pasture costs $4 per acre, how many cattle can Rancher Roy produce with a budget of $4,000? O 25 O 80 1,000 100 400