The cost, c, of carpeting a room is directly proportional to the area, a, of that room. a) given that the cost of 7.5m^2 of carpet for rebecca's bedroom is £168.75, find a formula connecting c and a. b) use your formula to find the cost of carpeting the lounge, which has an area of 14.5m^2, in the same carpet. c) the dining room costs £236.25 to cover in the same carpet. what is the area of the dining room?