Under maintenance

For example, we’ll take Promissory note.

PN       Promissory note nominal value
        Eskont the amount of interest
ES       Eskont sum (sum of Promissory note for the amount of eskont)
IK       Interest key (the numerical value which is obtained for 360 days a year and the eskont rate)
IN       Interest No.  is 100
We take one year, days of the year, 360 days.
TP       The time period of maturity promissory notes

Formula for calculating Eskont loan

E=PNxTPxES / 360xIN