low-profit store increased the purchase price of a refrigerator by 50%, and later advertised "20% discount, 30 yuan for delivery", but the profit was still 450 yuan per refrigerator. How much does each refrigerator cost?
微利商店将一台冰箱按进价提高50%，以后打出"八折优惠，外送30元钱"的广告，结果每台冰箱仍获利450元．每台冰箱进价多少元？
<gadget id="calculator">30 + 450</gadget>
<output>480</output>

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

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) * (1/2)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) - 1</gadget>
<output>-3/5 = around -0.6</output>

<gadget id="calculator">(4/5) + (-3/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">480 / (1/5)</gadget>
<output>2_400</output>

<result>2_400</result>