school needs to burn a batch of VCD discs for teaching. If you go to a computer company to burn them, each disc will cost 9 yuan (including blank VCD discs). Yuan (including blank VCD disk). To burn a batch of VCD discs, is it cheaper to go to the computer company to burn or the school to burn by itself? Please explain why.
某学校需要刻录一批教学用的VCD光盘，若到电脑公司刻录，每张需要9元(含空白VCD盘)，若学校自己刻录，除要购买刻录机280元外，每张还需成本4元(含空白VCD盘)．问刻录一批VCD光盘，到电脑公司刻录还是学校自己刻录费用较省？请说明理由．
<gadget id="calculator">280 / 5</gadget>
<output>56</output>

<result>56</result>