John adopts a dog.  He takes the dog to the groomer, which costs $100.  The groomer offers him a 30% discount for being a new customer.  How much does the grooming cost?
The groomer gave a 100*.3=$
<gadget id="calculator">100*.3</gadget>
<output>30</output>
30 discount.
So the grooming cost 100-30=$
<gadget id="calculator">100-30</gadget>
<output>70</output>
70.

<result>70</result>