Answer: 40 potatoes
Step-by-step explanation:
The number of potatoes that the vendor had to see previously to get $750 in profit is;
= (Fixed cost + Profit objective) / Contribution margin
= (600 + 750) / ( 4.90 - 1.03)
= 349 potatoes
Number of potatoes to be sold with increase in cost
= (600 + 750) / (4.90 - 1.03 - 0.4)
= 389 potatoes
Additional potatoes;
= 389 - 349
= 40 potatoes
Note : Contribution margin = Sales - Variable cost