Tire repair for each tire costs $7, plus another 50 cents for sales tax. If Juan needs all 4 tires repaired, how much is the final cost?
Juan pays 4*7 = 
<gadget id="calculator">4*7</gadget>
<output>28</output>
28 dollars for all four tire repairs.
Juan pays 0.50*4 = 
<gadget id="calculator">0.50*4</gadget>
<output>2</output>
2 dollars in sales tax for all four tire repairs.
Juan pays a total of 28+2 = 
<gadget id="calculator">28+2</gadget>
<output>30</output>
30 dollars.

<result>30</result>