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Calculate present value of an ordinary annuity or an annuity due.
annu.pv(pmt,i,n,type = 0)
:the equal amount of payment of each period
:interest rate accoding to the period
:number of periods
:type = 0 for ordinary annuity, type = 1 for annuity due
# NOT RUN { #annu.pv(100,0.0248,10,0) # }
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