Where, if any, did Missy first make a mistake finding the surface area of the snack box? Step 1: Missy did not calculate the area of the front or back sides correctly. Step 1: Missy did not calculate the area of the left or right sides correctly. Step 2: Missy did not multiply the area of each face by 2 before adding. Step 2: Missy did not multiply the area of each face by 3 before adding.