Based on estimates the data for 2 types of bridges with different lives are as follows. If the minimum attractive rate of return is 9%, determine the difference between the better method using Annual Cost Method.   Timber Bridge Steel Bridge First Cost P500k P1.4M Salvage Value 20k 100k Life in yrs 12 36 Annual maintenance 60k 25k   a. P36,727.43 b. P27, 763.25 c. P27,673.25 d. P23,673.43

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