Find the area devoted to each type of flower. Please help

Roses

Zinnias

Snapdragons

Petunias

Area of rectangle = length × width

Roses → 8 × 4 = 32 ft²

Zinnias → 12 × 8 - 8 × 4 = 64 ft²

Snapdragons → 12 × 16 - 12 × 8 = 96 ft²

Petunias → 20 × 16 - 12 × 16 = 128 ft²

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540