The Everton Manufacturing Company Collected the Following Information (In Days)

The Everton Manufacturing Company collected the following information (in days):
$$\begin{array} { | l | r | r | r | } \hline &{ \text { April } } & \text { May } & { \text { June } } \\\hline \text { Transporting product } & 2.0 & 3.0 & 2.0 \\\hline \text { Processing product } & 5.0 & 7.0 & 7.0 \\\hline \text { Inspecting product } & 0.5 & 0.8 & 1.0 \\\hline \text { Storing product } & 2.0 & 3.0 & 4.0 \\\hline\end{array}$$
Required:
a. Calculate the manufacturing cycle efficiency for April, May, and June.
b. Calculate the processing time required for June so that the manufacturing cycle efficiency is equal to the most efficient of the previous two months.