He family eats 36 donuts because 3 x 12 = <<3*12=36>>36
They need 72 ounces of coffee for these because 2 x 36 = <<2*36=72>>72
This is equal to six pots of coffee because 72 / 12 = <<72/12=6>>6
This will cost $18 to make because 6 x 3 = <<6*3=18>>18
#### 18