question: How many percent of couples that married in the 1980s that graduated high school , under the age of 26 that are not still together?
#1 return couples 
#2 return #1 in  the  1980s 
#3 return #2 that graduated high school 
#4 return #3 that married under the  age of 26 
#5 return #4 that are still together 
#6 return percent of #5 
#7 return the  difference of 100 percent and  #6