80% of the students are boys. 70% of the boys and 80% of the girls wear glasses. What percentage of the students do not wear glasses?
| Boys |
Girls |
Total |
| 80% |
20% |
100% |
| Wear glasses |
Do not wear |
Wear glasses |
Do not wear |
|
| 56% |
24% |
16% |
4% |
100% |
Number of boys who wear glasses
= 70% x 80%
=
70100 x 80%
= 56%
Number of girls who wear glasses
= 80% x 20%
=
80100 x 20%
= 16%
Percentage of students who wear glasses
= 56% + 16%
= 72%
Percentage of students who do not wear glasses
= 100% - 72%
= 28%
Answer: 28%
