math problem

Find the optimal crude oil allocation in the preceding example if the profit associated with fiber were cut in half, that is, fell to $.375 per square foot.

Samuelson, William F. (2012-05-01). Managerial Economics, 7th Edition (Page 214). Wiley. Kindle Edition.

MpG = ($0.50)(72-3MG) = 36 – 1.5MG
MpF = ($0.375)(80-4MF) = 30 – 1.5MF