Year  1991 average salary  $267,000               year 2001 average salary $1430000
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The growth in 10 years is 1430000/267000=5.3558 approx.

The annual increase is given by (1+r)¹⁰=5.3558, where r is the annual rate.

Take the tenth root of each side: 1+r=1.1827 so r=18.27% per year.

 

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