I took a loan of 300,000. I am paying it over 3 years installments. The markup is 14%. The monthly fix payment would be 10,253. Can someone tell me how my bank calculated this monthly payment?
You can see how the page below calculates it?
http://www.realkerala.com/calc_emi.htm

GB

Well, the bank calculated it using a financial calculator, i.e. the HP 12c. By your post, I'm assuming you do not own or know the working of one. So... you'll have to see it the long way. I believe, however, that is what you want. Simply Google loan payment formula. You should not have a problem finding the actual equation that is used in loan repayments. You can plug in the numbers from there. If you enjoy math, it will be fun. If not, have fun!

I'm confused. I use the page you linked to and got the same monthly payment of $10,253. Are you disputing this amount or do you just want to know how its arrived at?

If the latter, do a search on loan payment formulas. Generally, banks use a financial calculator to determine payments according to an amortization schedule.