The following table shows the number of pens and the number of erasers of 6 different colours that were sold from a stationery store during a given week.

The total number of erasers having colours C3 or C4 is approximately what percentage of the average number of pens of each colour?

107.14%

Average number of pens = \(\frac{20 + 24 + 40 + 22 + 26 + 36 }{6}\)

= \(\frac{168 }{6}\)

= 28

Total number of erasers of color C3 & C4 = 12 + 18 = 30

Required percentage = \(\frac{30}{28}\) × 100

= 107.14%