Teacher Chen from the school's general affairs office went to the supermarket to buy 28 of the same pens, which cost 448 yuan. According to this calculation, if Mr. Chen buys 8 more pens, how much will he have to pay in total? (Solve with ratio)
学校总务处的陈老师到超市买28枝同样的钢笔，需要448元钱．照这样计算，如果陈老师再买8枝钢笔，前后一共要付多少元钱？(用比例解)
<gadget id="calculator">448 * 8</gadget>
<output>3_584</output>

<gadget id="calculator">448 * 28</gadget>
<output>12_544</output>

<gadget id="calculator">3_584 + 12_544</gadget>
<output>16_128</output>

<gadget id="calculator">16_128 / 28</gadget>
<output>576</output>

<result>576</result>