Charis invested $140. she earned a simple interest of 3% per year on the initial investment. if ni money was added or removed from the investment, what was the amount pf interest charis received at the end of two years?

a.) $4.20

b.) $6.00

c.) $8.40

d.) $12.60

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.