A motor factory produced 500 motors in the previous year, and last year it increased by 10% compared to the previous year. How many motors did it produce last year?
一个电机厂前年生产电机500台，去年比前年增产10%，去年生产电机多少台？
<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">500 * (11/10)</gadget>
<output>550</output>

<result>550</result>