Explain in detail all the steps followed while solving

Syeda wants to invest an amount up to OMR 25,000 +7. Her agent suggests investing in three types of bonds P, Q and R, bond P yielding 10% return on the amount invested, bond yielding 12%+7 return on the amount invested and bond R yielding 15% a return on the amount invested. After some consideration, she decides to invest at least 5000 rials in bond P, at least 2,000+3 rials in bond Q and no more than 4,000+7 rials in bond R. Syeda also wants to invest at least as much in bond P as in bond R. What should her agent suggest if she wants to maximise her return on investments, Formulate a Linear programming