Uncle Li participated in the rural cooperative medical insurance. According to the terms and regulations: a deductible line is set for farmers' hospitalization medical expenses, and the deductible line for county-level medical institutions is 400 yuan, and 45% of the part above the deductible line is reimbursed; The part above the line is reimbursed at 70%. That is: reimbursement fee = (medical expenses - deductible line) * reimbursement rate. In May of this year, Uncle Li suffered from acute appendicitis and was hospitalized in a designated township hospital for 10 days. The medical expenses totaled 4,200 yuan. According to the terms and conditions, how much can Uncle Li be reimbursed?
李大伯参加了农村合作医疗保险．按条款规定：农民住院医疗费设起付线，县级医疗机构起付线为400元，在起付线以上的部分按45%报销；镇级医疗机构起付线为100元，在起付线以上的部分按70%报销．即：报销费=(医疗费-起付线)*报销率．今年5月份李大伯患了急性阑尾炎，在定点镇级医院住院治疗了10天，医疗费用共计4200元．按条款规定，李大伯可以报销多少元？
<gadget id="calculator">4_200 - 100</gadget>
<output>4_100</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">4_100 * (7/10)</gadget>
<output>2_870</output>

<result>2_870</result>