The Mexican one$-$year interest rate is $27$ percent, while the U$.$S$.$ one$-$year interest rate is $9$ percent. If a U$.$S$.$ firm creates a one$-$year deposit in Mexico, the Mexican peso would have to $\_\_\_\_$ against the U$.$S$.$ dollar by $\_\_\_\_$ in order to make that investment have an effective yield that is achievable in the U$.$S$.$