Final answer:
The potter makes a profit of $129 when a large fancy pot sells, after deducting the $30 cost of materials from the $159 that the pottery shop gets to keep from the selling price.
Step-by-step explanation:
To calculate the profit when a large fancy pot sells, we need to subtract the cost of the materials from the portion of the selling price that the pottery shop keeps. The cost of materials is about $30, and the shop keeps $159 of the selling price. Therefore, the profit can be calculated as:
Profit = Selling Price Kept by Shop - Cost of Materials
Profit = $159 - $30
Profit = $129
So, the potter makes a profit of $129 when a large fancy pot is sold.