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yield.dollar(cf, times, start, end, endtime)
$i^{dw}=\frac{I}{start*endtime-\sum_{k=1}^ncf_k*(endtime-times_k)}$
yield.time
yield.dollar(cf=c(500,-1000),times=c(3/12,18/12),start=25200,end=25900,endtime=21/12)
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