if an ark staring at 0 rises 3/8 of an inch an the only know you have is from 0 1 5/8 inch long what is the circumference of the circle

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.