A washing machine used to cost 360 yuan per unit, but now it has been reduced to 270 yuan. How much per cent has the cost of each machine been reduced?
一种洗衣机原来每台成本360元，现在降低到270元，每台成本降低了百分之几？
<gadget id="calculator">360 - 270</gadget>
<output>90</output>

<gadget id="calculator">90 / 360</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>