Asandwich costs 5: 70 and a piece of fruit costs 2: 15 if you have a 20 bill, how much change will you get ?

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.