So I was thinking about something I saw somewhere..
A fixed deposit kind of calculation and the math behind it..

I was to ask if anyone could shed more light on. It.


I have been able to calculate the normal compound interest..
But where I'm struggling is with added deposit or increased tenure..

Like let's say.
Mr A invsted 9,ooo,ooo for 500 days. At an interest rate of 9%, den after 200 days mr A decided to increase the principal by 5oo,ooo,
What is the interest going to be ? At the end of 500 days. With calculation please..