Bei'an Township is short of apples this year, with an output of only 36,000 tons, which is 10% less than last year. How many tons of apples did Bei'an Township produce last year?
北安乡今年苹果欠产，产量只有3.6万吨，比去年减产了一成，北安乡去年苹果的产量是多少万吨？
<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">3.6 / (9/10)</gadget>
<output>4</output>

<result>4</result>