the number of housing foreclosures in 2009 was 3.998 million, up 81% over 2007. what was the relative change?

number07*1.81=3.998

numberO7=3.998/1.81

relative change=
= (number09-number07)/numberO7
= 3.998(1-1/1.81)/(3.998/1.81
= 1.81(1-1/1.81)= you do it. Amazing