There are electric fan sets in the shopping mall. The purchase price of each set is 80 yuan, and the selling price is 105 yuan. All of them are sold. Please use the formula containing letters to express the profit obtained by the shopping mall: how many yuan.
商场有电风扇t台，每台进价为80元，售价105元，全部售出．请用含有字母的式子表示商场获得的利润：多少元．
<gadget id="calculator">105 - 80</gadget>
<output>25</output>

<result>25</result>