Arthur D. answered 08/01/14
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let x=the percent of monthly earnings spent on mortgage in 2006
x-41%x=13.6%
x-0.41x=0.136
0.59x=0.136
59x=13.6
x=13.6/59
x=0.2305
x=23.05%
check:
if you decrease 23.05% by 41%, that means you have now only 59% of it left
59% of 23.05%=0.59*0.2305=0.13599=13.599%≈13.6%