Robinson Products Company has two service departments $($S$1$ and S$2)$ and two production departments $($P$1$ and P$2).$ The distribution of each service department's efforts $($in percentages$)$ to the other departments is:

$\backslash$table$[[,$T$0],[$From$,$S$1,$S$2,$P$1,$P$2],[$S$1,-,20\%,30\%,?\%$