Question 184781
If you have to pay regular price of the first bottle, you are going to pay 100% of the purchase price. If you have to pay half price of the second bottle, you are going to pay 50% of the purchase price. Then, to determine what your overall discount is, you would add the two discounts and divide by 2. Therefore,
100% + 50% = 150% 
150% / 2 = 75% 
So, your overall discount would be 75%. 

Hope this helps! Good luck! Sandy :-)