In the case of pay back period technique which is used for evaluation of capital expenditure proposal in which the cash inflows are even and constant and the period can be computed by dividing the original investment to the annual cash-inflow. This can be also represented in number of years which are required to recover the original cash which has been invested in the project. This the method which is used to measure the period of time as it takes for the original cost of the project which has to be re3covered from the earning which are additional to the project.