20% of the pupils are boys. 60% of the boys and 80% of the girls wear spectacles. What percentage of the pupils do not wear spectacles?
| Boys |
Girls |
Total |
| 20% |
80% |
100% |
| Wear spectacles |
Do not wear |
Wear spectacles |
Do not wear |
|
| 12% |
8% |
64% |
16% |
100% |
Number of boys who wear spectacles
= 60% x 20%
=
60100 x 20%
= 12%
Number of girls who wear spectacles
= 80% x 80%
=
80100 x 80%
= 64%
Percentage of pupils who wear spectacles
= 12% + 64%
= 76%
Percentage of pupils who do not wear spectacles
= 100% - 76%
= 24%
Answer: 24%
