A required sale price is a condition, not a forecast
Sometimes the question runs backwards: given a cost and a net amount to test, what sale price makes the equation balance? The answer is what would be required mathematically, not what someone will pay.
Define the target as a net amount
Start with total acquisition cost including the entered fees. Add the target profit as a currency amount and account for sale charges. Divide the required gross proceeds by the number of units.
Investor.gov highlights asking how much an investment must rise to cover costs. Check the actual fee schedule before comparing hypothetical arithmetic with a real quotation.
References: Investor.gov — Understanding fees
A percentage fee changes the equation
When a charge takes a percentage of sale proceeds, simply adding that percentage to purchase cost is not enough. Solve for proceeds that leave the intended amount after the charge on those proceeds.
Do not confuse a currency-profit target with a return percentage. In this model, a 100% sale fee leaves no positive proceeds to cover a cost or profit: no larger price repairs that assumption.
The required price is not an executable offer
The equation does not test demand, liquidity, regulations or taxes. If the assumed price does not occur, neither does the assumed result.
Use the result to check arithmetic and compare assumptions, not as a buy or sell recommendation or evidence that a previous loss can be recovered.
Check the answer by working forward
Ten units bought at 50 with a fixed purchase fee of 5 cost 505. A net target of 40 with a fixed sale fee of 5 requires gross proceeds of 550, or 55 per unit.
Working forward: 10 × 55 −5 −505 = 40. This verifies the equation under the stated inputs only, not that 55 is an available or appropriate price.