There is a color TV set in the Hongyuan Electric Store. If it is sold at a 10% discount to the listed price, it can make a profit of 215 yuan. If it is sold at a 20% discount, it will make a loss of 125 yuan. So how much is the price of this color TV set?
宏远电器商店有一种彩色电视机，如果按标价降价10%出售，可以盈利215元，如果降价20%出售，就会亏本125元．那么这台彩色电视机的标价是多少元？
<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>