I just only need assistance on the second and third question

Answer for Question $1$:

Difference in interest rate $=3\mathrm{.}2\%-4\mathrm{.}8\%=-1\mathrm{.}6\%$

Yes, CIA profit potential $=-1\mathrm{.}6\%+2\mathrm{.}198\%=0\mathrm{.}00598=0\mathrm{.}598\%$

Invest in Switzerland currency and borrow American dollars