Answer Happy

Assuming the total number of students studying in the top four
universities in the Philippines is approximately 158,000.
And the distribution is as follows:
University of the Philippines (UP) - 40% of the total number
Ateneo de Manila University (ADMU) - 23,700
De La Salle University (DLSU) - 25% of the total number
University of Santo Tomas - 20% of the total number
And only the following number of students owns a tablet
computer:
20% of UP students
85% of ADMU students
90% of DLSU students
85% of UST students
What is the total market penetration of tablet computers among
the students of the top four universities?
What is the total market size of tablet computers in the top
four universities?