Question $5$: $(20$ points$)$

Suppose that the following instructions are found at the given locations in memory:

$\backslash$table$[[20,$LDA $50],[21,$ADD $51],[22,$STO $52],[50,30],[51,35],[52,5]]$

a$-$ Show the contents of the IR$,$ the PC$,$ the MAR, the MDR$,$ and A at the conclusion of instruction $20.(5$ points$)$

b$-$ Show the contents of the registers $($IR$,$ the PC$,$ the MAR, the MDR$,$ and A$)$ and the memory cells $51$ and $52,$ at each step of the fetch$-$execute cycle for the instructions $21$ and $22.(15$ points$)$