I am not sure that I have figured the Total Variable Costs and the Marginal Cost correctly?

Smart cell phones produced n an hour O 15 30 45 60 75 90 105 120 3 Total Cost $3,200 $3,525 $3,875 $4,250 $4650 $5,075 $5,525 $6,725 $8,210 .9 Total Fixed Costs (TFC) (2 points) a. $3,200 $3,200 $3,200 $3,200 $3,200 $3,200 $3,200 $3,200 $3,200 .200 Variable Costs $0.00 $325 $675 $1 ,050 $1 ,450 $1 ,875 $2,325 $3,525 $5,010 $6.75 Total Variable Costs (2 points) b. n/a $4,875 $20,250 $47,250 $87,000 $140,625 $209,250 $370,125 $601 ,200 011.250 Average Total Costs (ATC) (2 points) n/a $235 $129.17 $94.44 $77.50 $67.67 $61.39 $64.05 $68.42 73 Average Fixed Cost (AFC) (2 points) d. n/a $213.33 $106.67 $71.11 $53.33 $42.67 $35.56 $30.48 $26.67 23.70 Marginal cost (MC) (3 points) n/a $21.67 $23.33 $25.00 $26.67 $28.33 $30.00 $80.00 $99.00 16.00