Calculation Problem

I have given a discount on a product that is 10% discount. The original cost of the product is $39.99 , and my price is $35.99.

The problem is i have created a wholesale option like buy 2+ $62.98 , 3+ $79.99 etc etc. Now when i try increase my amount to 2 and click Add to cart button , than i see on a shopping cart it is showing $71.98. it is calculating with 35.99 * 2 = $71.98

It is not showing a wholesale price that is $62.98, why the discount was not adding. Please extremelly help. :roll: