Answer:
F = Total Revenue at 4 units
= Price * Quantity demanded
= 30 * 4
= $120
G = Total Revenue at 5 units
= Price * Quantity demanded
= 30 * 5
= $150
H = Total Cost at 0 units
= Fixed Costs + Variable Costs
= 8 + 0
= $8
I = Total Cost at 1 unit
= Fixed Costs + Variable Costs
= 8 + 20
= $28
J = Total Cost at 2 units
= Fixed Costs + Variable Costs
Fixed costs are fixed at $8 so (A) is $8
= 8 + 30
= $38