In a social practice activity for middle school students with a theme meeting "Learning to Survive", in order to exercise himself, Chunhua bought several cultural shirts with the logo of the 2008 Beijing Olympic Games from the wholesale market at a price of 6 yuan each by understanding the market conditions. Go to the free market to sell. When 30 pieces are sold, the sales amount reaches 300 yuan, and the price of the remaining pieces is reduced by 2 yuan. The sale is completed soon. At this time, the sales amount reaches 380 yuan. How much is your income?
在一次主题会"学会生存"的中学生社会实践活动中，春华同学为了锻炼自己，他通过了解市场行情，以每件6元的价格从批发市购进若干件印有2008北京奥运标志的文化衫到自由市场去推销，当销售完30件之后，销售金额达到300元，余下的每件降价2元，很快推销完毕，此时销售金额达到380元，春华同学在这次活动中获得纯收入多少元？
<gadget id="calculator">380 - 300</gadget>
<output>80</output>

<gadget id="calculator">300 / 30</gadget>
<output>10</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">80 / 8</gadget>
<output>10</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">4 * 30</gadget>
<output>120</output>

<gadget id="calculator">20 + 120</gadget>
<output>140</output>

<result>140</result>