Robinson Products Company has two service departments $(S1$ and $S2)$ and two production departments $($P$1$ and $P2).$ The distribution of each service department's efforts $($in percentages$)$ to the other departments is:

$\backslash$table$[[,$To$],[$From$,$S$1,$S$2,$P$1,$P$2],[$S$1,-,10\%,20\%,?\%$