I was a Saturday girl in Marks and Spencer, working on menswear where all the shirts were priced with the odd 11d.... 19/11d, 29/11d and the luxury range at 39/11d (and yes, that's how the tickets were written, although maths experts amongst you and Brits of a certain age will know that 39/11d is actually £1 19 11d). And I became quite quick, rounding up to the nearest 10s and removing the extra pennies. These days, what with decimal currency AND electronic tills, the sales staff don't know how lucky they are.
Oh, and I was kept on my toes, because my Dad was the manager of the store where I was working, and he would sneak up on me and suddenly say he'd have four of these and two of those so how much change would he get from a tenner ...

Anne