I thought I was bad at math until the Burger King app showed up. Tried to use the app to place an order for the Whopper meal for 2 for $10.99. After adding cheese to both sandwiches it updates the total to 11.99, when I go to check out the price jumped up to almost $17.00, but if I added the loyalty perk to upgrade the drink for free it lowered the cost to just under $16.00. I couldn't use the "redeem in store" because it wasn't available anymore