"Currency units
'Definition
.EUR = 1
.USD = 0.92EUR
.BGN = 0.511291881196218EUR
'Conversion
10BGN|USD
20EUR|BGN
30EUR|USD
'Usage
'Unit price - 'p = 15USD/m
'Order length -'L = 100m
'Total price in USD -'P = p*L|USD
'Total price in EUR -'P|EUR