"Consider the project balances for a typical investment project with a service life of four years.
The 'An' for years 0 through 4 are: ($)
-10,000
2,209
The symbol '--' represents missing numbers, not 0.
The project balance at the end of the given years (n = 0 through 4) are: ($)
-10,000
-8,300
-5,500
-4,000
633
Determine the interest rate used in computing the project balance. Enter your answer as a percentage between 0 and 100."