Suppose the rate of change of the interest paid on the public debt of the United States as a percent of federal expenditures can be modeled by , where t is the number of years past 1930. Use integration and the fact that in 1975, the interest paid as a percent of Federal Expenditures was 12.7, to find the function D(t) that models the interest paid on the public debt of the United States as a percent of federal expenditures. If it's necessary, round your calculations to three decimal places.
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