 
 <translate> Since average price of a pencil = 2
∴ Price of 75 pencils = 150
∴ Price of 30 pens = (690 – 150) = 540
∴ Average price of a pen = 540⁄60 = 18
Thus, the answer is (C). <hau> Tun da matsakaicin farashin fensir = 2 <unk> Farashin fensir 75 = 150 <unk> Farashin alkalami 30 = (690 <unk> 150) = 540 <unk> Matsakaicin farashin alkalami = 540⁄60 = 18 Saboda haka, amsar ita ce (C). 