Present Worth Method of comparison In this method of comparison the cash flow of each alternative will be reduced to time zero by assume that interest rate I then depending on the type of decision the best alternative will be selected by comparing the present what amount of the alternatives. The sign of various amounts at different points in time in a cash flow diagram is to be decided based on the type of the decision problem. In a cost dominated cash flow diagram the cost (outflows) will be assigned with positive sign and the profit revenue Salvage value all the inflows etc. will be assigned with negative sign. In a revenue/profit dominated cash flow diagram the profit revenue Salvage value or inflows to an organisation will be assigned with positive signs. The cost or outflows will be assigned with negative sign. In case the decision is to select the alternative with the minimum cost than alternative with the least present worth amount will be selected. On the other hand if