During the end of December 2008, a telephone company carried out a recharge reward activity for customers: one recharge of more than 200, 5% of the recharge amount as a free call fee; one recharge of 500 yuan or more, a free recharge of 12% of the recharge amount as a call fee. Manager Wang has recharged 3 times during this month, which are 300 yuan, 100 yuan and 600 yuan respectively. If he combines these three times into one recharge, then how much more will the free call fee be than the actual situation.
在2008年底12月期间，某电话公司对客户进行充值回馈活动：一次充值200以上，赠送充值金额的5%作为话费：一次充值500元以上，赠送充值金额的12%作为话费．王经理在这个月期间一共充值3次，分别是300元、100元、600元．如果他把这三次合并为一次充值，那么赠送的话费会比实际情况多出多少元．
<gadget id="calculator">200 + 100 + 600</gadget>
<output>900</output>

<gadget id="calculator">12 / 100</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">900 * (3/25)</gadget>
<output>108</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">300 * (1/20)</gadget>
<output>15</output>

<gadget id="calculator">600 * (3/25)</gadget>
<output>72</output>

<gadget id="calculator">15 + 72</gadget>
<output>87</output>

<gadget id="calculator">108 - 87</gadget>
<output>21</output>

<result>21</result>