A clothing store is running a sale. If you buy two T-shirts at the original price, you only need 10 yuan to buy the third one. Xiao Ming bought 12 T-shirts and spent a total of 1200 yuan. So, how much is the original price of a T-shirt.
一家服装店进行促销．如果以原价购买两件T恤衫，买第三件只需10元．小明买了12件T恤衫共花了1200元．那么，一件T恤衫的原价是多少元．
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">1_200 - 40</gadget>
<output>1_160</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">1_160 / 8</gadget>
<output>145</output>

<result>145</result>