John buys a pair of earbuds that cost $200.  If tax was 15%, how much did he pay after tax?
The tax was 200*.15=$
<gadget id="calculator">200*.15</gadget>
<output>30</output>
30.
So he paid 200+30=$
<gadget id="calculator">200+30</gadget>
<output>230</output>
230.

<result>230</result>