The proper sequence to use in solving 3x-2=60 is:

divide by 3. add 2
add 2. divide by 3
multiply by 3. subtract 2
subtract 2. multiply by 3

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

the answer is 21%.