Answer: $4.140 per gallon
Explanation:
Costs including wastage for 210 gallons:
3,300 ounces of grape concentrate at $0.03 per ounce:
= 
= 100
357 pounds of granulated sugar at $0.36 per pound
:
= 
= 151.2
294 lemons at $0.63 each = 
= 264.6
840 yeast tablets at $0.28 each = 840 × 0.28
= 235.2
1,050 nutrient tablets at $0.11 each = 1,050 × 0.11
= 115.5
3,100 ounces of water at $0.001 per ounce = 3,100 × 0.001
= 3.1
Hanks estimates that,
1% of the grape concentrate is wasted
15% of the sugar is lost
30% of the lemons cannot be used
Hence,
Cost for 210 gallons = 100 + 151.2 + 264.6 + 235.2 + 115.5 + 3.1
= $869.6
Hence, cost per gallon = 
=
= $4.140 per gallon