When Xiaohong calculated 36 divided by a number, because the decimal point of the quotient was wrong by one place to the right, the result was 21.6 larger than the correct answer. What should be the correct answer to this question?
小红在计算36除以一个数时，由于商的小数点向右点错了一位，结果比正确答案大了21.6，这道题的正确答案应是多少？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">21.6 / 9</gadget>
<output>2.4</output>

<result>2.4</result>