Comprehension Passage
Directions: Read the given bar graph carefully and answer the following questions accordingly.
The bar graph below shows the total number of Red, Blue and Green balls being sold by 4 shops A, B, C and D in the year 2020.
Find the difference between the total number of balls sold by the Shop A and the total number of balls sold by the Shop B.
1
50
2
60
3
70
4
30
5
40