Uncle Li bought a five-year national construction bond of 4,000 yuan, with an annual interest rate of 3.81%. How much is Uncle Li's principal and interest at the time of maturity?
李叔叔购买了五年期的国家建设债券4000元，年利率是3.81%．到期时，李叔叔的本金和利息共有多少元？
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