After the earthquake in Wenchuan County, Sichuan Province, Yucai Primary School held a "heart to hand" book donation activity. The fifth grade donated 108 books, 10% less than the sixth grade. How many books did the sixth grade donate?
四川省汶川县发生大地震之后，育才小学举行了"心手相连"的捐书活动．五年级共捐了108本书，比六年级少捐10%，六年级捐了多少本书？
<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">108 / (9/10)</gadget>
<output>120</output>

<result>120</result>