At a seaport, the depth of the water, h metres, at time t hours, during a certain day is given by h=3.1sin2 π(t-4)/12.4+6.7.
What is the maximum depth of the water?
A. 3.6m
B. 3.1m
C. 7.7m
D. 9.8m

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.