I hate math (so here's some free points)

thx

Step-by-step explanation:

Thx person! The anwser is 21

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

i think that you should ask google for the answer to that problem because if we don't know it google does