Now the cost of producing a water heater is 216 yuan, which is 10% lower than before. How much was the original cost of producing this water heater?
现在生产一种热水器需要的成本是216元，比原来降低了10%，原来生产这种热水器的成本是多少元？
<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">216 / (9/10)</gadget>
<output>240</output>

<result>240</result>