The purchase price of a commodity is 160 yuan, the original price is 200 yuan, and it is sold at a 10% discount on the original price. What is the profit margin at this time?
一件商品的进价是160元，原价200元，按原价打九折售出，此时的利润率是多少．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">200 * (9/10)</gadget>
<output>180</output>

<gadget id="calculator">180 - 160</gadget>
<output>20</output>

<gadget id="calculator">20 / 160</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/8) * 1</gadget>
<output>1/8 = around 0.125</output>

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