I dunno about this.
The British used to have the most-excellent monetary system in the world, four farthings to the penny, twelve pennies to the shilling, five shillings to the crown, four crowns to the pound, and twenty-one shillings to the guinea.
A wonderful system.
But then the British decided that instead of being British, they wanted to be like everybody else, and switched their system to decimal.
One supposes it "simplified" things for idiots and the retarded--reasonable people of course knew the system--but it had an unintended consequence.
Inflation.
Inflation, either price-wise or size-wise.
Newspapers that had been sixpence (6d) under the old system, or exactly the equivalent of 6 cents, American (the British pound was then waving between $2.38 and $2.42, making a penny worth an American cent), suddenly became three new pence (3p) under the new system, the equivalent of 7.2 cents, American.
This was in 1971, and there existed then no compelling reason for the inflation.
Twenty percent inflation.
Multiply that by all the other things the British bought and paid for.
Or look at the standard 12-ounce aluminum can of soda in this country, which is .355 of a liter. If we converted to this fad, one could easily see a soda producer thinking, "Well, .350 of a liter is easier to deal with than .355," and downsize his product accordingly.....without also downsizing the price.
Conversion costs money, and I'm not talking about repainting road-signs here.
People who HAVE to figure out things by tens are pretty stupid anyway.