Geometry math question no guessing and show work

Sum of internal angles on same side of transversal is 180

(8x-14) +(2x+54) =180

10x +40 =180

10x =140

x=14

option D x=14 is correct

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