SOLUTION: Benny’s income in 2009 was $1200 for the first 8 months.It was 25% less for the rest of the year. His total income in 2009 was 10% more than his total income in 2008. Find his av

Question 1164368: Benny’s income in 2009 was $1200 for the first 8 months.It was 25% less for the rest of the year. His total income in 2009 was 10% more than his total income in 2008. Find his average monthly income in 2008.
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
i believe you meant 1200 income per month for the first 8 months.
i'll assume that since, having that as total income for the first 8 months doesn't make a lot of sense.

you have:

1200 for each of the first 8 months.
1200 * .75 = 900 for each of the last 4 months.
this makes total income in 2009 = 1200 * 8 + 900 * 4 = 13200 total income for 2009.
divide that by 1.10 to get 12000 total income in 2008.
divide that by 12 to get 1000 average monthly income in 2008.

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