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manual calculation of interest , discount , depreciation is very difficult because when increasing the principal amount or increase the no. of different block assets we can not calculate these value manually with in seconds . For calculation these values which are very useful for business takes many hours . But thank ms excel , with the help of ms excel we first apply dollar formula which is very easy and with its help we can calculate all type of interest , discount , commission , remuneration on sale with some percentage . Learn and enjoy . If you are facing difficulty write me at my email address vinod_13242002@yahoo.com for more guidance or give comments in last or write your email address in contact me link .