Its Christmas and your father gives you $1,000 to invest in stocks and loans. For each dollar invested in stocks yields $0.1 profit, and each dollar invested in a loan yields $0.15 profit. At least 30% of all money invested must be in stocks, and at least $400 must be in loans. Determine how you can maximize the profit earned on your investments. USE SOLVER. Decision variables, Constraints, objective function.