The company's sales this year are 6.6 million yuan, an increase of 10% compared with last year. What is the sales volume of last year?
今年公司的销售额660万元，比去年增加一成，则去年的销售额为多少万元．
<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">660 / (11/10)</gadget>
<output>600</output>

<result>600</result>