6-59. A high-quality filter for tap water and a reusable drinking container cost $75 and typically will last for three years. If a family drinks an average of eight cups of water per day (one cup is 8 fluid ounces), the consumption of water is 547.5 gallons over a three-year period. Tap water costs $0.01 per gallon. Alternatively, bottled water may be purchased in 16-ounce bottles for

$1.29 each. Compare the present worth of tap filtered water versus bottled water if the family can earn 10%

per year on their investments. Assume uniform water consumption over the three-year study period. (6.6)