The canteen used 10% more flour on the second day than the first day in May, and 5% less flour on the third day than the second day. What percentage of the flour used on the third day was the first day?
食堂5月份第二天用的面粉比第一天多10%，第三天用的面粉比第二天少5%，第三天用的面粉是第一天的百分之几？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">(11/10) * (19/20)</gadget>
<output>209/200 = around 1.045</output>

<result>209/200 = around 1.045</result>