On Children's Day, Xinhua Bookstore has a 10% discount on all books. Xiao Cong bought a children's book with 21.6 yuan. How much is the original price of this children's book?
"六一"儿童节，新华书店的图书一律九折优惠，小聪用21.6元的钱买了一本儿童读物，这本儿童读物原价多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">21.6 / (9/10)</gadget>
<output>24</output>

<result>24</result>