One price, a discount and a sales tax. Watch the receipt add them up line by line, then see the one-step shortcut, and why the order doesn't matter.
Set the scenario
The shortcut: one multiplier each
Multiplying doesn't care about order: price × 0.75 × 1.07 is the same as price × 1.07 × 0.75. Flip the switch and watch the receipt change while the total stays put.