The following chart shows the sales (in thousands) of pens, pencils and books in month1, month2 and month3. Answer the question based on the chart.

Which product has the highest sales in all 3 months ?

Pencils

Total sale of pencils = 6.7 + 7.3 + 6.2 = 20.2

Total sale of pens = 5.6 + 4.9 + 4.6 = 15.1

Total sale of books = 4.5 + 5.7 + 6.3 = 16.5

Sale of Pencils is  highest.