[Doctor Stochastic]

A burger flipper ought to be able to figure out a bill when the register is broken. Perhaps even the tax (from a table, not too hard.) A few can do this. Most can't.

How can they even hope to get promoted to a headwaiter as the requires remembering people's names and likes over various visits.

[Beagle8U]

"A burger flipper ought to be able to figure out a bill when the register is broken."

If the bill is 18.99, give the burger flipper 20.01 and watch them spin in circles.

Even if they punch it into the register to figure your change, half the time they would give you change for $21.00.