if ($total eq "3") {
 $revenue = 30;
 } elsif ($total eq "6") {
 $revenue = 48;
 } elsif ($total eq "10") {
 $revenue = 50;
 }

##</code><code>##

 if ($total eq "3") {
 $revenue += 30;
 }
 if ($total eq "6") {
 $revenue += 48;
 }
 if ($total eq "10") {
 $revenue += 50;
 }