The cost of producing a water heater is 216 yuan, which is 1/9 lower than the original cost. How much was the original production cost?
生产一种热水器的成本是216元，比原来降低了(1/9)，原来的生产成本是多少元？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 - (1/9)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">216 / (8/9)</gadget>
<output>243</output>

<result>243</result>