Mike has to get an x-ray and an MRI.  The x-ray is $250 and the MRI is triple that cost.  Insurance covers 80%.  How much did he pay?
The MRI cost 250*3=$
<gadget id="calculator">250*3</gadget>
<output>750</output>
750.
So between the two things he pays 250+750=$
<gadget id="calculator">250+750</gadget>
<output>1_000</output>
1000.
Insurance covered 1000*.8=$
<gadget id="calculator">1000*.8</gadget>
<output>800</output>
800.
So he had to pay 1000-800=$
<gadget id="calculator">1000-800</gadget>
<output>200</output>
200.

<result>200</result>