If the platform charges a percentage of the final price, raising the price also raises the fee. Adding the percentage to the cost can leave you below the margin you want.
An example with numbers
With a $60 unit cost, a 10% fee on the sale and a 20% margin target on the price, seven tenths of the price are left to cover the cost. The price needed is 60 ÷ 0.70, about $85.72 rounded up.
Try it with your numbers
Enter the costs, the fee and the target margin. Review separately any taxes or returns not included in that scenario.
Example figures for learning purposes. They are not a recommendation and do not replace professional advice.