The cost of first-class postage has risen by about 5% per year over the past 30 years.

Question:

The cost of first-class postage has risen by about 5% per year over the past 30 years. The U.S. Postal Service introduced a one-time forever stamp in 2008 that cost 41 cents for first-class postage (one ounce or less), and it will be valid as first-class postage regardless of all future price increases. Let's say you decided to purchase 1,000 of these stamps for this one-time special rate. Assume 5% inflation and your personal is 10% per year (im). Did you make a sound economical decision?
MARR
Minimum Acceptable Rate of Return (MARR), or hurdle rate is the minimum rate of return on a project a manager or company is willing to accept before starting a project, given its risk and the opportunity cost of forgoing other...