An investor purchased $300$ shares of CISCO systems in $2000$ at $$60.$ In $2001$ he bought another $200$ at $$35$ and finally another $400$ shares at $$18$ in $2002.$ In $2014,$ he sold $200$ shares at $$24$ per share. What is the adjusted cost base of the shares that he sold?

Question $11$ options:

$$18\mathrm{.}00$

$$60\mathrm{.}00$

$$37\mathrm{.}67$

$$35\mathrm{.}78$