How is the price of my trip being formed?

Initially, the YACHT  PRICE depends on the season of the journey.
It is natural that during the summer, especially August, the prices will be higher than in April or September.
We have 4 levels of season prices (from winter to top season).
WINTER              01/01/19 - 12/04/19            
SPRING              13/04/19 - 31/05/19          
SUMMER             01/06/19 - 19/07/19           
HIGH SEASON     20/07/19 - 23/08/19    
EARLY AUTUMN   24/08/19 - 04/10/19
AUTUMN              05/10/19 - 01/11/19           
WINTER              02/11/19 - 31/12/19           

Each season value is subject to additional discounts depending on the duration of the journey and whether you are a "REPeater" (-10%).
It is easy to calculate the Duration discount since it is similar to the trip's Duration:
For 7 days trip 7%, for 14 days trip 14%, for 19 days trip 19% and so on.
For more than 20 days trip, duration discount is 20%

*It is obvious that all these additional discounts accumulated can not exceed a certain percentage of the season’s price.
Something similar, but with different rates, applies to our skipper and hostess since they are not third persons but our permanent partners.