Answer:
The answer is A) increasing at an increasing rate
Step-by-step explanation:
To determine the effect on Joan's total cost-curve we need to calculate the actual cost per pumpkins produced at the bag 1, bag 2 and bag 3.
1 bag yields 500 pumpkins at a cost of $100 at a cost of $0.2 per pumpkin
2 bags yield 800 pumpkins at a cost of $200 at a cost of $0.25 per pumpkin
3 bags yield 900 pumpkins at a cost of $300 at a cost of $0.33 per pumpkin
Therefore the more pumpkins she plants the higher he costs become. However the nature in which the costs are increasing is at an increasing rate. The cost per pumpkin is higher at every interval of added bags. Thus the answer is A.
Increasing at an increasing rate.