The turnover of a supermarket this week is 105,000 yuan, an increase of 5% from last week. How much is the turnover of last week?
某超市本周的营业额是10.5万元，比上周增加了5%，上周的营业额是多少万元？
<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">10.5 / (21/20)</gadget>
<output>10</output>

<result>10</result>