Mr. Zhang has been teaching for more than ten years, and recently he also suffered from the teacher's occupational disease "pharyngitis" and it is quite serious. I saw it several times in the outpatient clinic but did not see any improvement. After listening to the doctor's advice, I was hospitalized for surgical treatment for a week and spent a total of 6,800 yuan (including 300 yuan for the outpatient service). Because Mr. Zhang bought a social insurance at the school, the social insurance clause stipulates that only 80% of the hospitalization expenses will be compensated. How much will Mr. Zhang have to pay in total?
张老师教书十多年，最近也患上了教师职业病"咽喉炎"且比较严重．在门诊看了几次也未见好转，听取医生建议住院手术治疗了一周，共花费了6800元(其中包括了门诊消费的300元)．因张老师在学校买了份社保，此份社保条款规定只赔偿住院消费的80%，张老师一共要自付多少元？
<gadget id="calculator">6_800 - 300</gadget>
<output>6_500</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">6_500 * (1/5)</gadget>
<output>1_300</output>

<gadget id="calculator">1_300 + 300</gadget>
<output>1_600</output>

<result>1_600</result>