Hello Alain,

My point was that during a business conversation people have no
interest getting lost in mental currency conversions while comparing
prices from Euro to their old local currency. This is why they
still like to use the old local currency during business conversations.

Time will fix this problem!

You are right my brain is rusty and I have problems with the
20/3 French Euro to Francs conversion method.
(It takes me more than 1 second to do a mental conversion).

Try the mental conversion of 5507 Euro in Francs!

Below are the two 20/3 conversion methods.
(The second one is more precise).

Conversions Euro to Francs
5507 Euro * 6.55957 = 36123.55 French Francs

===========================
The 20/3 method:

5507 Euro /3 = 1835 ~
1835 * 20 = 36713 Francs

===========================
The (20 / 3 – 0.1) method:

5507 Euro /3 = 1835 ~
1835 * 20 = 36713 Francs
1/10 of 5507 = 550 ~
36713 - 550 = 36136 Francs
===========================


Best regards,

Luciano Rustybrain