How to do EMI payment in asp.net

Question

i want to develop a emi calculations page sir ,

i have a table with following details

Name Madhu

TotalAmount 1Lac

Monthlypay 5000

NumberofMonths 12

Startdate 1st Nov 2015

EndDate 1st Nov 2016

for this table , i want to develop a payment page and payment track sir ,

ex

for 1 lac amount customer has to pay 5000 rs installment monthly for 12 months.

in payment track page i want to show payment status in grid

if customer not paid emi for 2 months i want to show due amount 5000+5000=10000

How to do this sir,

am not asking complete code sir

please suggest me the steps to develop this,

or give me any useful links .

thanks in advance