For a commodity, the wholesaler sells it to merchants at 25% off the price, and the merchant sells it at 10% off the price. The price is 900 yuan. What is the profit of each commodity for the merchant?
一种商品，批发商按定价的七五折卖给商户，商户又以定价的9折出售，售价为900元，求商户每件商品盈利多少？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">900 / (9/10)</gadget>
<output>1_000</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(9/10) - (3/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1_000 * (3/20)</gadget>
<output>150</output>

<result>150</result>