http://tinyurl.com/39f59ej
For those of us on this side of the pond, I'd substitute 50 cents for his 50 pence, in which case I've given the answer below (I'll let him explain the reasoning on Monday ---
ADDENDUM: I originally stated a WRONG answer below (now corrected) --- Wiseman's explanation here:
http://tinyurl.com/22k4mpv
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answer:
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