A store increases the purchase price of refrigerators by 50% and offers a "20% discount reward". As a result, each refrigerator can still make a profit of 420 yuan. How much is the purchase price of each refrigerator?
某商店将冰箱按进价提高50%后打出"八折酬宾"，结果每台冰箱仍可获利420元，每台冰箱的进价是多少元？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/2) * (4/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) - 1</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">420 / (1/5)</gadget>
<output>2_100</output>

<result>2_100</result>