Problem $4-04$

$\backslash$table$[[,$PRICE,,SHARES$],[$Company$,$A$,$B$,$C$,,$A$,$B$,$C$],[$Day $1,$$$13,$$$21,$$$54,,520,350,210],[$Day $2,11,24,55,,520,350,210],[$Day $3,13,42,60,,520,{175}^a,210],[$Day $4,13,42,32,,520,175,{420}^b$