Add a new input between taxes and base price that allows user to input a percentage number and automatically calculates base price based on buy price. Maybe do the same for every price. Obviously the binding must be both ways, if user inputs price the app must update the percentage of earnings for that price.
Add a new input between taxes and base price that allows user to input a percentage number and automatically calculates base price based on buy price. Maybe do the same for every price. Obviously the binding must be both ways, if user inputs price the app must update the percentage of earnings for that price.