Answer
$\begin{array}{ll}
{\text { $\quad$ }} & {\text {LOAD$\quad$} }& {\text {X} } \\
{\text { $\quad$ }} & {\text {ADD} }& {\text {FIFTY} } \\
{\text { $\quad$ }} & {\text {STORE} }& {\text {X} } \\
{\text { $\quad$ }} & {\text {.} }& {\text {} } \\
{\text { $\quad$ }} & {\text {.} }& {\text {} } \\
{\text { $\quad$ }} & {\text {.} }& {\text {} } \\
{\text {FIFTY: $\quad$ }} & {\text {DATA} }& {\text {50} } \\
{\text {X: $\quad$ }} & {\text {DATA} }& {\text {0} } \\
\end{array}$
Work Step by Step
$\begin{array}{ll}
{\text { $\quad$ }} & {\text {LOAD$\quad$} }& {\text {X} } \\
{\text { $\quad$ }} & {\text {ADD} }& {\text {FIFTY} } \\
{\text { $\quad$ }} & {\text {STORE} }& {\text {X} } \\
{\text { $\quad$ }} & {\text {.} }& {\text {} } \\
{\text { $\quad$ }} & {\text {.} }& {\text {} } \\
{\text { $\quad$ }} & {\text {.} }& {\text {} } \\
{\text {FIFTY: $\quad$ }} & {\text {DATA} }& {\text {50} } \\
{\text {X: $\quad$ }} & {\text {DATA} }& {\text {0} } \\
\end{array}$