A smart phone is priced at 1,200 yuan this year, which is 1/5 lower than last year. How much was the price last year?
一部智能手机，今年售价为1200元，比去年降低了(1/5)，去年售价是多少元？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_200 / (4/5)</gadget>
<output>1_500</output>

<result>1_500</result>