/* torb.kb */


low( price_increase, 0 ).
high( price_increase, 100 ).
scale( price_increase, 'percent' ).
fuzzy_set( price_increase, low     , down(0, 25) ).     % Minimal increase in price.
fuzzy_set( price_increase, moderate, tri(20, 50, 75) ). % Noticeable increase but not extreme.
fuzzy_set( price_increase, high    , up(70, 100) ).     % Highest increase in price.


if class = "business" 
then 
   price_increase := moderate.

if class = "tourist" 
then 
   price_increase := low.