The table below records the intermediate steps that go into producing a cell phone and the value added at each step. For example, company A produces the outer case and keyboard, and sells it to company B for $$4\mathrm{.}00,$ who installs the internal hardware, adding $$8\mathrm{.}00$ in value.

Intermediate steps to produce a cell phone

Company Steps Value added at each step

A Assemble outer case and keyboard $$4\mathrm{.}00$

B Prepare internal hardware $$8\mathrm{.}00$

C Install operating system $$12\mathrm{.}00$

D Connect to network $$40\mathrm{.}00$

Apple Store Transact retail sale $$100\mathrm{.}00$

The price of the unfinished cell phone that company C sells to company D is $