How to discount a number by a percentage

Question

Hi all,
I am trying to think of the best way to discount a number from an access db.
Basically  it's an online hotel room tariff. So if someone clicks they want to  stay 5 nights I want to be able to call the base price from the db and  then times it by 5 and then discount a percentage per night. Or have I  just made this way too complicated and over looked an easier solution.
Thanks
Jonathan

Answer 1

Without sitting down and planning, one way would be...
Table: Discounts (3 cols)
ID    Nights    DiscountRate
1     2            10
2     3            10
3     4            15
4     5            15
5     6            20
etc etc - you wouldn't need to go more then 30 nights I wouldn't think.
Code: (I'll just keep it brief)
NumberOfNights = 4
TotalStayBeforeDiscount = 400 ($100 per night = $400)
Select DiscountRate from Discounts where Nights = NumberOfNights
TotalStayDiscount = TotalStayBeforeDiscount * query.DiscountRate / 100 (should = $60)
TotalStay = TotalStayBeforeDiscount - TotalStayDiscount
With the above you could then display the rate before discount, the discount, and the final total.
You should also do some validation to make sure the query returns something, if it doesn't, then no discount is applied (or displayed).
Hope this helps.