75% off $200 = $50. You save $150.
Equation: $200 − (75% × $200) = $200 − $150 = $50.
Another way to read it: you pay 25% of the original price — that's $50.
$50. The discount is $150 and the final price you pay is $50.
You pay $50 (before tax). That's $200 minus a $150 discount.