Answer:
you should prepare 180 pounds of the deluxe mix and 75 pounds of the economy mix
Step-by-step explanation:
maximize 7d + 4.7e
constraints
0.5d + ¹/₃e ≤ 115
0.5d + ²/₃e ≤ 140
d ≥ 0
e ≥ 0
d and e are integers
using solver, the maximum profit is 180d + 75e, and the maximum profit is $1,612.50