On 13/04/2013 19:54, Dave Liquorice wrote:
On Sat, 13 Apr 2013 19:14:08 +0100, polygonum wrote:

(And the way shops mix up price per 100 ml, per litre, per 500 g, etc.
Comparisons may be possible, but why keep changing the units?
Definitely not to our benefit.)

At least those are normally 1l/100ml, 1kg/100g, it's easy to shift the
decimal place in your head, unlike working out the 2fer example I posted
earlier.

It is not when the units are differently dimensioned unless you are in a
position to estimate that, say, washing-up liquid is probably mostly
water so is likely to have a density very close to 1 ml = 1 g. Not true
for everything.

Though I do accept your confusing offers issues.

--
Rod