Charlotte needs to know how much money to have with her when she goes to the shoe store. How much money should Charlotte bring to buy a pair of boots, if the original price is $90 and there is a discount of 20%?
The amount of the discount is 20/100 * $90 original price = $
<gadget id="calculator">20/100*90</gadget>
<output>18</output>
18.
Charlotte needs to bring the $90 - $18 discount = $
<gadget id="calculator">90-18</gadget>
<output>72</output>
72.

<result>72</result>