******USING EXCEL SOLVER - determine how much O- and D-Type Fuel (in pounds) John needs, and his total cost!**********

John owns a shipping company and is looking to minimize how much he spends on fuel. He needs at least 10000 pounds of fuel per day, and his trucks operate on a special mixture of O-Type Fuel and D-Type Fuel.

The truck's fuel must contain at least 60 units of hydrogen per pound of fuel mix and at most 9 units of oxygen per pound of fuel mix to operate. The oxygen/hydrogen concentration and cost for O-Type Fuel and D-Type Fuel are as follows:

Fuel Type	Hydrogen Concentration	Oxygen Concentration	Cost
O-Type Fuel	45 units per pound	15 units per pound	$1.05 per pound
D-Type Fuel	90 units per pound	6 units per pound	$1.34 per pound

John must determine how much O-Type Fuel and D-Type Fuel he should mix, in pounds, to minimize his cost of fuel per day.