From the base price level of $100$ in $1981,$ Saudi Arabian and U$.$S$.$

price levels in $2010$ stood at $410$ and $100,$ respectively. Assume the

$1981$ $$/$riyal exchange rate was $$0\mathrm{.}34/$riyal$.$ Suggestion: Using the

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 $0\mathrm{.}34.$What should the exchange rate be in $2010?$