question: are eighty percent of the items shown here also matte items?
#1 return items  shown here 
#2 return #1 that  are matte 
#3 return number of  #1 
#4 return number of  #2 
#5 return the  division of #4 and #3 
#6 return #5 in percent 
#7 return if  #6 is  eighty