Volumes I to IV of "Famous Mathematicians" are sitting in numerical order between two bookends on a table. Each cover of a volume is 0.5cm thick, and the pages of each volume between the covers are 5cm thick. What is the distance between page 1 of Volume I and the last page of Volume IV? (Hint: It's not 23cm.

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.