Discount Profit Calculator — illustrative example

INPUT
Price $50, unit cost $30, proposed discount 10%.

RESULT
Discounted price: $45. Profit falls from $20 to $15; equal total profit would require one-third more units under these assumptions.

REVIEW
A discount changes profit per unit even when volume stays constant. Compare contribution before and after the offer with the same cost assumptions.

This is a teaching example, not a live execution record.