Helen has to buy all the butter she needs to make 60 biscuits. She buys the butter in 250 g packs. What is the exact amount of butter she needs? 400
g

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.