You observe the following current rates: exchange rate: $$0\mathrm{.}01/$yen$.$ Annual interest rate on $90-$day U$.$S$.$ dollar$$denominated bonds: $4\%.$ Annual interest rate on $90-$day yen$-$denominated bonds: $4\%.$ a$.$ If uncovered interest parity holds, what spot exchange rate do investors expect to exist in $90$ days?