"Those now-elderly customers who, supposedly, can't cope with metric units had to and did adapt to decimal currency."
I wonder how folks would cope if the move went the other way?
I joined the agricultural chemical industry in 1975 at the point just after agrochemical application rates had been shifted from Imperial to metric. Until that point, chemicals had been applied as fl oz or pounds/oz of formulation in x gallons of water applied to y acres/sq yds. etc - often by people with little idea of algebra. It became ml or g per litre of water per hectare - so much easier to work out!
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