Don't worry. They'd have been on the job anyhow, no matter when you left. But it's just as easy to figure out the tip for two as for one. All you have to do is to add fifty per cent. and then divide it into two halves, and give one to each girl. Or, better still, give it all to one girl and tell her to give half to her pal. If there are three chambermaids, as you sometimes find in the swell hotels, you add another fifty per cent. and then divide by three. And so on.