60% of the pupils are boys. 30% of the boys and 80% of the girls wear spectacles. What percentage of the pupils do not wear spectacles?
| Boys |
Girls |
Total |
| 60% |
40% |
100% |
| Wear spectacles |
Do not wear |
Wear spectacles |
Do not wear |
|
| 18% |
42% |
32% |
8% |
100% |
Number of boys who wear spectacles
= 30% x 60%
=
30100 x 60%
= 18%
Number of girls who wear spectacles
= 80% x 40%
=
80100 x 40%
= 32%
Percentage of pupils who wear spectacles
= 18% + 32%
= 50%
Percentage of pupils who do not wear spectacles
= 100% - 50%
= 50%
Answer: 50%
