Xiao Ming's mother bought a color TV with 20% discount in the home appliance supermarket, and spent 2,400 yuan. After a few days, the mall sold this color TV at 25% off the original price. Compared with how much money my mother spent ?
小明的妈妈在家电超市买了一台八折的彩电，用了2400元，过了几天，商场又将这种彩电以最初价格的七五折出售，相比之下妈妈多花了多少钱？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2_400 / (4/5)</gadget>
<output>3_000</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3_000 * (3/4)</gadget>
<output>2_250</output>

<gadget id="calculator">2_400 - 2_250</gadget>
<output>150</output>

<result>150</result>