There are 105 students in the fourth grade to go to the acrobatic show. Ordinary fares are 12 yuan per person, and group fares are only 8 yuan per person. Question: How much less can these students pay in total if the tickets are sold as group fares?
四年级有105个同学去看杂技表演．普通票价每人12元，团体票价每人只需8元．问：如果按团体票价来出售的话，这些同学一共可以少付多少元？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">105 * 4</gadget>
<output>420</output>

<result>420</result>