A color TV, if sold at a 10% reduction in price, can make a profit of 215 yuan, and if sold at a 20% reduction in price, it will lose 125 yuan. How much does this color TV cost?
一种彩电，如果减少定价的10%出售，可盈利215元，如果减少定价的20%出售，就亏本125元．这种彩电定价多少元？
<gadget id="calculator">215 + 125</gadget>
<output>340</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/5) - (1/10) - 1</gadget>
<output>-9/10 = around -0.9</output>

<gadget id="calculator">1 + (-9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">340 / (1/10)</gadget>
<output>3_400</output>

<result>3_400</result>