The price of a certain food in the first week of August this year is 10% higher than that of the previous week, and the price of the second week is 5% higher than that of the first week. How much is the price increase in two weeks?
某种食品今年8月第一周比上一周涨价10%，第二周比第一周涨价5%．两周一共涨价百分之几？
<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>21/20 = around 1.05</output>

<gadget id="calculator">1 * (11/10) * (21/20)</gadget>
<output>231/200 = around 1.155</output>

<gadget id="calculator">(231/200) - 1</gadget>
<output>31/200 = around 0.155</output>

<result>31/200 = around 0.155</result>