 
<translate> Ebe ọ bụ na ọnụahịa nke pensụl = 2 <unk> Ọnụ ego pensụl 75 = 150 <unk> Ọnụ ego mkpịsị 30 = (690 <unk> 150) = 540 <unk> Ọnụ ego nke otu mkpịsị akwụkwọ = 540⁄60 = 18 N'ihi ya, azịza ya bụ (C). <eng> 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). 