A repeater used to cost 240 yuan per unit, but now it costs 210 yuan per unit. How much is the price reduction for each unit now?
一种复读机原来每台售价240元，现在每台售价210元，现在每台降价百分之几？
<gadget id="calculator">240 - 210</gadget>
<output>30</output>

<gadget id="calculator">30 / 240</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>