Given the first term and the common difference of an arithmetic sequence find the recursive formula and the three terms in the sequence after the last one given. show work please!

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