How many square feet of outdoor carpet will we need for this hole?

Given:
Level 1 : Length = 5 ft ; Width = 2 ft
Level 2 : Length = 6 ft ; Width = 2 ft
Level 3 : Length = 4 ft ; Width = 2 ft

Area = L x W

Level 1 = 5 ft * 2 ft = 10 ft²
Level 2 = 6 ft * 2 ft = 12 ft²
Level 3 = 4 ft * 2 ft =   8 ft²
Total Area                30 ft²

Outdoor carpet should measure 30 square feet to cover the hole.

It’s c. i’m almost sure