- Percentage Increase / DecreaseChoice D
$$ Sale\ price\ using\ the\ coupon =25+15=40 $$

$$ Regular\ price \times(1-20\%)= Sale\ price\ using\ the\ coupon $$

$$ =>Regular\ price \times(1-20\%)= 40 $$

$$ => \therefore Regular\ price = \frac{40}{(1-20\%)} =50 $$

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