Interesting line in the Dallas Business Journal - - "In the next seven years, officials [North Texas Municipal Water District] expect water rates to rise 10 percent a year." The Rule of 72 is a quick tool to quantify what this means. The Rule of 72 provides an estimate of when an investment/cost increase would double. You divide 72 by the rate of return - - in the case of a 10% annual water rate increase - - your water bill will double in around seven years.
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