Please Answer Both Questions

a. 42 x 39 = 1638 ft²

b. small = 12(large)

small = 12(48)

= 576

576 - 48 = 528 more small posters

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