The original price of a color TV is 4,200 yuan, but now the price has been reduced by 30%. How much is each color TV now?
一种彩电原价4200元，现在降价30%，现在每台彩电多少元？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">4_200 * (7/10)</gadget>
<output>2_940</output>

<result>2_940</result>