Dimensionally inconsistent xD
When you buy fries + burger + drinks = happy meal the price get discounted. So ya all that give a number 15 is totally wrong. Think about it when you go to McDonald's. If you only buy a meal combo consist of fries drink and burger the price of it a lot cheaper than you buy a separated item. So I would predicted the price somewhere between 11~13. This to attract ppl buying a combo instead of only 1 item.