How does EXP rate and boosts work?

Question

How are the exp rate calculated when you add a boost?

I´ll provide an example to better illustrate my question.

If I have 150% exp (the 40-42h bonus) and I use a 50% exp boost I will have a exp rate of 225%, which is 150%*1,5.
But if there is an event such as double exp, will I receive 150%*2 = 300%?
And if I then use a exp boost during the event will I then receive 300*1.5 = 450%?

Are there a difference between double exp and bonuses granted from world events such as "a piece of cake event", which gives 50% exp bonus?

Answer 1

It goes like this:

(100%+ 100% (if its double exp weekend) + 100% (voucher, not possible anymore) + 50% (exp boost from store) + 40% max (prey) + other bonusses from event orso) x 1.5 (if you have happy hour) = your total exp %