Study the given bar-graph and answer the question that follows.
The bar-graph shows the sales of six different brands of blue and green pens in a town on a given day.

The total number of blue pens sold on that day of all the six brands taken together is how much percentage more than the total number of green pens sold on that day of all the brands taken together? [Give your answer correct to 1 decimal place.]

40.9%

Total number of blue pens = 42 + 48 + 52 + 64 + 44 + 60 = 310 

Total number of Green pens = 27 + 33 + 39 + 51 + 42 +  28

= 220

Required percentage = \(\frac{310 - 220 }{220}\) × 100

= \(\frac{90}{220}\) × 100

= 40.9%