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