Help, please I would really appreciate it

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

it's undefined because anything multiplied by 0 is 0. that said, 7 days is 168 hours