Answer:
a. The contribution to income from selling the consumable milk is:
= 1,000,000 gallon * $3
= $3,000,000
b. The contribution to income from processing the consumable milk into butter is:
= (1,000,000 gallon*0.5 gallon) * ($6 - $1.50)
= 500,000 gallon * $4.50
= $2,250,000
c. Bart's should continue to sell the consumable milk, rather than processing the consumable milk into butter due to high contribution of $750,000 ($3,000,000 - $2,250,000).