A computer is now priced at 3,600 yuan, which is 10% cheaper than before. How much was it originally?
一种电脑现在售价3600元，比原来便宜10%，原来多少元？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3_600 / (9/10)</gadget>
<output>4_000</output>

<result>4_000</result>