Diptarka

Suppose sally bought x no of ordinary prencils. Therefore, she 4x no of special pencils. Expenditure on ordinary pencil = $0.20*x Expenditure on special pencils = $0.35*4x o.20*x+ 0.35*4x = 14.40 x= 26 so she bought 26 ordinary pencil and 4*26=104 special...