Comprehension Passage
Directions: Read the following graph and answer the following question.
The line graph shows the the sales of number of mobile and the cost of each mobile.
Total cost of mobile = Cost per mobile × Total sales of that type of mobile
What is the ratio of the difference of number of Nokia mobile and Lava mobile sold to the Redmi mobile and Vivo mobile sold ?
1
3 : 4
2
4 : 9
3
3 : 7
4
7 : 3