The payment systems which use pre-paid magnetic swipe cards are not all that wonderful. We
had one put into the office last week to operate the tea and coffee dispensing machine. I was
somewhat surprised to find, after having five coffees, that I had spent 121 p, and my colleague,
after four teas, had spent 82 p. We were assured that there had been no changes in the prices;
the problem appears to be that if you ask the machine how much you have left, it deducts a
‘service’ charge for this ‘service’. We both enquired once. Charges for tea, coffee and service
are whole numbers.
What is the minimum that the service charge could be?
A 1 p
B 2 p
C 4 p
D 6 p
E 14 p
Please, help me. Thank you!
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