90% of the students are girls. 40% of the girls and 80% of the boys wear watches. What percentage of the students do not wear watches?
Girls |
Boys |
Total |
90% |
10% |
100% |
Wear watches |
Do not wear |
Wear watches |
Do not wear |
|
36% |
54% |
8% |
2% |
100% |
Number of girls who wear watches
= 40% x 90%
=
40100 x 90%
= 36%
Number of boys who wear watches
= 80% x 10%
=
80100 x 10%
= 8%
Percentage of students who wear watches
= 36% + 8%
= 44%
Percentage of students who do not wear watches
= 100% - 44%
= 56%
Answer: 56%