250 grams of toffee, eat 10%, and then increase by 10%, how many grams of toffee are there now?
250克奶糖，吃掉10%，再增加10%，现在有奶糖多少克．
<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">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">250 * (9/10) * (11/10)</gadget>
<output>495/2 = around 247.5</output>

<result>495/2 = around 247.5</result>