When your income is more than your expenses, you have

Surplus

Step-by-step explanation:

Income is what money you are taking it, expenses is what  money we need to spend. We are taking in more then is going out. We have made a surplus amount of money/

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