There is a piece of clothing in the clothing store. On the first day, it is sold at the original price, but no one comes to buy it. On the second day, the price is reduced by 10%, but no one comes to buy it. On the third day, the price is reduced by 120 yuan, and finally it is sold. It is known that the selling price is exactly 78% of the original price, how much is the original price of this dress?
服装店有一件衣服，第一天按原价出售，没人来买，第二天降价10%，仍没有人来买，第三天再降价120元，终于售出，已知出售的价格恰好是原价的78%，原来这件衣服的价钱是多少元？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">78 / 100</gadget>
<output>39/50 = around 0.78</output>

<gadget id="calculator">1 - (1/10) - (39/50)</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">120 / (3/25)</gadget>
<output>1_000</output>

<result>1_000</result>