A classroom is 8m long, 6m wide, and 3.5m high, and the painting fee is 2.5 yuan per square meter. How much does it cost to paint this classroom? (Note: The area of the door and window blackboard is about 25 square meters)
一间教室，长为8m，宽为6m，高为3.5m，每平方米粉刷费2.5元，粉刷这间教室需要多少钱？(注：门窗黑板面积约25平方米)
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 3.5 * 2</gadget>
<output>56</output>

<gadget id="calculator">6 * 3.5 * 2</gadget>
<output>42</output>

<gadget id="calculator">42 - 25</gadget>
<output>17</output>

<gadget id="calculator">48 + 56 + 17</gadget>
<output>121</output>

<gadget id="calculator">2.5 * 121</gadget>
<output>302.5</output>

<result>302.5</result>