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Hi,
This 5.335 figure is the annuity factor at 10% for 8 years.
AF = (1-(1+r)^-n)/r
It is essentially a combination of 1/1.10 + 1/1.10^2 + 1/1.10^3… 1/1.10^8.
We use this factor for project appraisal when the expected inflow ($500,000) stays the same each year, throughout the project horizon (8 years).
Hope this helps.
