A store is engaged in promotional activities. A mobile phone is currently priced at 600 yuan each, with a profit of 20%. If the original price can make a profit of 30%, how much will the price of the mobile phone be reduced in this promotional activity?
某商店搞促销活动，一手机现在每部售价600元，获利20%，如果按原售价可获利30%，则该手机的价格在这次的促销活动中降价多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">600 / (6/5)</gadget>
<output>500</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">500 * (13/10)</gadget>
<output>650</output>

<gadget id="calculator">650 - 600</gadget>
<output>50</output>

<result>50</result>