Pioneer Store’s sales in the year before last was 500,000 yuan, and last year’s sales were 1 million yuan. How much did last year’s sales increase compared to the previous year?
先锋商店前年的销售额是50万元，去年的销售额是100万元，去年的销售额比前年增了多少
<gadget id="calculator">100 - 50</gadget>
<output>50</output>

<gadget id="calculator">50 / 50</gadget>
<output>1</output>

<result>1</result>