From the base price level of $100$ in $1979,$ Saudi Arabian and U$.$S$.$ price levels in $2008$ stood at $430$ and $872,$ respectively. Assume the $1979$ $$/$riyal exchange rate was $$0\mathrm{.}42/$riyal$.$ Suggestion: Using purchasing power parity, adjust the exchange rate to compensate for inflation. That is$,$ determine the relative rate of inflation between the United States and Saudi Arabia and multiply this times $$/$riyal of $0\mathrm{.}42.$

What should the exchange rate be in $2008?$