An investment company wants to compare between three investment proposals and choose one of them? What project do you choose from?

During the calculation of the payback period in the two ways and what is the difference between them.

( ) ( ) 100 40 30 30 120 60 60 30 140 90 60 60 ( ) ( ) 100 40 30 30 120 60 60 30 140 90 60 60