Question 465432
a)80%+35%-60%=1.15-.6=.55 who buy both
b)80% buy a printer. 40% of those who buy a laptop do not buy a printer, so .35x.40 or .14 buy a laptop alone, so 94% buy either a printer or laptop.
c).55x.80=all who bought a laptop, given the (s)he bought a printer=44%..