denoted by d,
is the ratio of the amount of interest (sometimes called the "amount of discount" or just "discount" ) earned during the period to the amount invested at the end of period.
dn=A(n)-A(n-1)/A(n)=In/A(n)
c.f. in=In/A(n-1)
The relationship between i and d:
i=d/1-d, d=i/1+i
d=iv=i-v
i-d=id
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