Answer:
D. Profit of $20
Step-by-step explanation:
Current profit: Revenue - Cost = 400*0.75 - (400*0.25 + 200) = 0 (breaks even)
Because raising price will not have any effect on sales, the sales volume would still be 400
The price is raised from $.75 to $.80
The new profit would be 400 * 0.80 - (400*0.25 + 200) = $20
That would also be the additional profit (20 - 0 = 20)