30% off sale price for a refrigerator is 1680 yuan. How much is the original price of this refrigerator?
一台电冰箱打七折出售是1680元，这台电冰箱原价是多少元？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1_680 / (7/10)</gadget>
<output>2_400</output>

<result>2_400</result>