Dad bought a suit, and the price after the 25% discount was 120 yuan cheaper than the original price. How much is the original price of this suit? (column equation)
爸爸买了一套西服，打七五折后的价钱比原价便宜了120元．这套西服的原价是多少元？(列方程)
<gadget id="calculator">120 / 0.25</gadget>
<output>480</output>

<result>480</result>