Formulate a linear programming model and solve with Solver. SHOW ANSWER USING EXCEL AND SOLVER ONLY.

1. A farm consists of 600 acres of land, of which 500 acres will be planted with corn, soybeans, and wheat, according to these conditions:

1. At least half of the planted acreage should be corn.
2. No more than 200 acres should be soybeans
3. The ratio of corn to wheat planted should be 2:1

It costs $20 an acre to plant corn, $15 an acre to plant soybeans, and $ 12 an acre to plant wheat.