Uncle Wang participated in the rural cooperative medical insurance in our county. The clause stipulates: farmers' inpatient medical expenses shall be compensated at the deductible line, the county-level hospital shall pay 400 yuan, and the part above the deductible line shall be compensated at 45%. This year, Uncle Wang suffered from acute enteritis and was hospitalized in the County People's Hospital for 29 days, with a total medical expenses of 8,200 yuan. According to regulations, how much should Uncle Wang pay?
王大伯参加了我县农村合作医疗保险．条款规定：农民住院医疗费补偿起付线，县级医院400元，在起付线以上的部分按45%补偿．今年王大伯患急性肠炎在县人民医院住院治疗29天，共计医疗费8200元．按规定王大伯自付多少元？
<gadget id="calculator">8_200 - 400</gadget>
<output>7_800</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">7_800 * (11/20)</gadget>
<output>4_290</output>

<gadget id="calculator">4_290 + 400</gadget>
<output>4_690</output>

<result>4_690</result>