An auto shop has a part that Clark needs for $80. Clark buys 7 of them and got a discount. If Clark only had to pay $439, how much was the discount?
Originally the car parts would be a total of 80*7 = 
<gadget id="calculator">80*7</gadget>
<output>560</output>
560 dollars.
Clark got a discount for 560-439 = 
<gadget id="calculator">560-439</gadget>
<output>121</output>
121 dollars.

<result>121</result>