Two newspapers A and B are published in a city. It is known that 25% of the city population reads A and 20% reads B while 8% reads both A and B.…

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