Investment linear programming problem

Investment Linear Programming Problem

You now have $1000. The following investments are available to you during the next three years:

INVESTMENT A. Every dollar invested now yields $0.20 a year from now and $1.25 three years from now.
INVESTMENT B. Every dollar invested now yields $0.10 a year from now and $1.40 two years from now.
INVESTMENT C. Every dollar invested a year from now yields $ 1.60 three years from now.

During each year uninvested cash can be placed in money market funds, which yield 8% interest per year. At most 30% of the total dollar amount invested can be in A, at least 25% in B, and at most 40% in C.