A bag of caramel cookies has 20 cookies inside and a box of cookies has 4 bags in total. How many calories are inside the box if each cookie is 20 calories? Let's be accurate as possible.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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If 1 bag has 20 cookies and a box has 4 bags, then in total there are 20 * 4 = 80 cookies inside the box. If 1 cookie has 20 calories and there are 80 cookies in the box, then the box has in total 20 * 80 = 1600 calories.
The answer: 1600.