Two newspapers A and B are published in a city.
It is known that 25% of the city populations reads
A and 20% reads B while 8% reads both A and
B. Further, 30% of those who read A but not B
look into advertisements and 40% of those who
read B but not A also look into advertisements,
while 50% of those who read both A and B look
into advertisements. Then the percentage of the
population who look into advertisement is :-