please help with average and marginal cost and cost of consumption

A.

B.

answers for B.

63

66.25

70

73.5

Based on the example water bill shown below. 1) The average price is: $ /1000 gallons 2) The marginal price is: $ /1000 gallons Item Cost Flat-rate fee $5 $4 Monthly usage |--Water usage charged at $2/1000 gallons Total cost $9 Based on the information below, calculate the total cost to consume 100,000 gallons. Gallons of Water Marginal Price 10 0 1 0 2 0 5 0 6 0.25 30 0.25 31 10.5 60 0.5 61 1 90 1 91 1.5 120 1.5 2 121 150 2