$18.$The one$-$year risk$-$free rate in the U$.$S$.$ is $4\mathrm{.}980$ percent and the one$-$year risk$-$free rate in Mexico is $7\mathrm{.}52$ percent. The one$-$year forward rate between the Mexican peso and the U$.$S$.$ dollar is MXN$12\mathrm{.}418/$$$.$ What is the spot exchange rate? Assume interest rate parity holds.