While buying DVDs at the store, Maria received a 25% discount. If the discount she received is $40, how much did she pay in total?
Since 100 percent represent the original price, and she received a 25% discount which is $40, the original price is 100/25*40 = 
<gadget id="calculator">100/25*40</gadget>
<output>160</output>
160.
Maria paid $160-$40 = $
<gadget id="calculator">160-40</gadget>
<output>120</output>
120 after receiving the twenty-five percent discount.

<result>120</result>