In a certain code, $\text{RAIN}$ is written as 8\ \%6$and$ \text{MORE}$iswrittenas$ 7\#8@$.Howis$ \text{REMAIN}$ written in that code?

This is a direct substitution code where each character is replaced by a specific digit or symbol:
* From $\text{RAIN}$: $\text{R}\to 8$, \text{A}\rightarrow \$,$ \text{I}\rightarrow \%$,$ \text{N}\rightarrow 6$\ast From$ \text{MORE}$:$ \text{M}\rightarrow 7$,$ \text{O}\rightarrow \#$,$ \text{R}\rightarrow 8$,$ \text{E}\rightarrow @$Nowfindthesymbolsfortheword$ \text{REMAIN}$:\ast$ \text{R} \rightarrow 8$\ast$ \text{E} \rightarrow @$\ast$ \text{M} \rightarrow 7$\ast$ \text{A} \rightarrow \
$$\ast$ \text{I} \rightarrow \%$\ast$ \text{N} \rightarrow 6$So,$ \text{REMAIN}$iscodedas$ 8@7\$\%6$.