I thought they got the tip if they got more than the minimum pay in tips.
Otherwise, DD used the tip to pay them.
Meaning - if you somehow work one job and it takes an entire hour - and you got a $10 tip - you would only make $29, not $29 + $10x1 = $39.
If you worked 1 hour and did 5 jobs - each with $10 tips - you would get paid $50 - not $29 + $10x5 = $79.