In a certain class,40% of the students are girls; and 20% of the girls wear glasses. what percentage of the children in the class are girls wear glasse?

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.