Rewrite the difference as a sum of the fractions using the lowest common denominator 2/3 from 5/6

2/3 - 5/6 = 1/6

LCM of 3 and 6 : 6
3,6
6

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers