%*I want to solve the problem without using the Linear Programming Problem method

*There are social workers who are planning to plant some apple trees and orange trees on a land of 50 acres. *The land planted with apple trees requires 5 workers per acre and 5 tons of fertilizer per acre. It will yield a $500 profit per acre. *The land planted with orange trees requires 4 workers per acre and 7 tons of fertilizer per acre. It will yield $600 profit per acre. Currently, there are 150 workers and 200 tons of fertilizer available

Question is: How many acres of apple trees and how many acres of orange trees will they plant in order to receive the maximum profit? What is the maximum profit?