The original price of a learning machine is 840 yuan each, and the price is now reduced by 120 yuan. The current price is lower than the original price ((())/(())).
一种学习机原价每台840元，现降价120元出售，现在售价比原价降低((())/(()))．
<gadget id="calculator">120 / 840</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>