To produce a machine part, the current cost per piece is 15 yuan, which is 5 yuan less than the original cost. What percentage of the original cost is the current cost?
生产一种机器零件，现在每件成本是15元，比原来节约成本费5元，现在的成本是原来成本的百分之几？
<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">15 / 20</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>