The National Government is planning to construct a bridge. At present a 4-lane bridge will be built, but it is expected that at a later date a second 4-lane bridge will be added. If an8-lane bridge can be built now, it will cost ₱8,100,000. A single 4-lane bridge can be built now for ₱5,500,00 . It is estimated that a second 4-lane bridge at a later date will cost ₱8,000,000. Annual upkeep on each 4-lane bridge will cost ₱91,500 and for the 8-lane bridge would be ₱115,000. Money to built the bridge will cost 12%. Assume a 50 year functional life for the project and determine the earliest time at which the additional 4-lanes would be required to make it equally economical to build the 8-lane bridge immediately.

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