Problema Solution
the income of Anny's family in 2008 is $65,000. From 2008 to 2011, the income of the family increased by 20% per year. What's the total amount of income of Anny's family from 2008 to 2011?
Answer provided by our tutors
the income of Anny's family in 2008 is $65,000
the income of Anny's family in 2009 is 65,000 + 0.20*65,000 = 65,000*1.20
the income of Anny's family in 2010 is 65,000*1.20 + 0.20*65,000*1.20= 65,000*1.20^2
the income of Anny's family in 2011 is 65,000*1.20^3
he total amount of income of Anny's family from 2008 to 2011 is
65,000 + 65,000*1.20 + 65,000*1.20^2 + 65,000*1.20^3 = $348,920