Your overall costs (1200) exceed your overall revenue(1150) so you are still
in a loss situation.

If you plot this data and add predicted data for year 4 you will see when
real profit occurs. For example, if costs for year 4 are 800 and revenue is
1200., overall profit is reached about February of Year 4.

Adding the trendlines/equations for both cost & revenue will help.

"Imran" wrote:

We have years 1, 2 and 3 where the revenues are 100, 350 and 700 with costs
of 200, 400 and 600 respectively. Therefore, the profits are started to flow
from year 3.

I need to find out the formula which could calculate the fraction of the
year in which the costs will equal to reveues.

"Toppers" wrote:

.... more information please. Describe the problem.

"Imran" wrote:

Is there any formulae to work out break even point