$$Mikhail$\text{'}$s Portfolio.$$Mikhail Khodorkovsky was one of the infamous Russian$$ oligarchs, accumulating billions of dollars in wealth in the$$ mid$-1990$s with the fall of the Soviet Union. But in $2003$ he had been imprisoned by the Russian state for a decade. Upon his release from prison in $2013$ he had taken up residence in Switzerland$$with his money. In November $2014$ Mikhail held a portfolio of USD$208$ million and CHF$155$ million in Swiss$$ banks, in addition to accounts in Russia still holding RUB $1\mathrm{.}3$ billion. Using the exchange rate table LOADING... $,$ answer the$$ following:

a$.$ What is the value of$$ Mikhail's portfolio measured in Russian$$ rubles?

b$.$ What is the value of$$ Mikhail's portfolio measured in Swiss$$ francs?

c$.$ What is the value of$$ Mikhail's portfolio measured in U$.$S$.$ dollars?

d$.$ Which currency demonstrated the greatest fluctuations in total value over the six$$ dates?