Directions (Q. 20 – 24): Refer to the graph and answer the given questions.
Date related to the number of scarves sold by two stores (M amd N) during 5 years. 
20. What is the difference between the total number of scarves sold by store M in 2003 and 2004 together and the total number of scarves sold by store N in 2005 and 2006 together?
1) 160
2) 100
3) 140
4) 150
5) 120
21. The number of scarves sold by store M decreased by what percent from 2004 to 2005?
1) 40 
2) 45 
3) 42
4) 30
5) 35
22. If the ratio of the total number of scarves sold by stores M and N together in 2002 to that in 2009 is
15 : 11, what is the total number of scarves sold by stores M and N together in 2009?
1) 430
2) 450
3) 420
4) 460
5) 440
23. If the total number of scarves sold by stores M and N together in 2008 is 70% of that in 2006, what is
the total number of scarves sold by stores M and N together in 2008?
1) 408
2) 406
3) 414
4) 396
5) 522
24. What is the average number of scarves sold by store N in 2003, 2004 and 2005?
1) 260
2) 270
3) 290
4) 250
5) 280
please provide some hints , it will be greatfull
Ok thanks for your feedback