pv present value
previously
fv future value
function function
parameters parameters
rate interest rate speed
nper n + per period how many periods are there in the period
pmt payment
type payment type end of period 0 beginning of period 1
pv 4+fv
fv 4+pv
ppmt principle +pmt Principal part
paid ipmt interest +pmt Interest part paid
rate nper pmt can be used as a parameter (parameters of other functions)
or as a function