The knife factory sold 3,400 sets of knives last year, and this year it sold 600 more sets than last year. What fraction of last year's sales volume was this year's?
刀具厂去年销售刀具3400套，今年比去年多销售600套，去年的销售量是今年的几分之几？
<gadget id="calculator">3_400 + 600</gadget>
<output>4_000</output>

<gadget id="calculator">3_400 / 4_000</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>