A Product Design Team Is Preparing to Build a New

A product design team is preparing to build a new doohickey. A doohickey consists of one A module, one B module, and one C module. There are different versions of these modules available in the company's design library. For example, there are two choices for A: A1 is .99 reliable, while A2 is .975 reliable. The table below details the choices available, along with the cost of each choice.
$$\begin{array} { | l | l | l | } \hline \text { Module variation } & \text { Reliability } & \text { Cost, each } \\\hline \text { A1 } & .99 & \$ 17 \\\hline \text { A2 } & 975 & \$ 10 \\\hline \text { B1 } & 995 & \$ 4 \\\hline \text { B2 } & 992 & \$ 3 \\\hline \text { C1 } & 98 & \$ 2 \\\hline \text { C2 } & 90 & \$ 0.50 \\\hline \text { C3 } & 60 & \$ 0.25 \\\hline\end{array}$$ Help the design team by selecting the least costly version of a doohickey that has system reliability of at least .96. Draw a schematic of your finished design.