Of 200 people, how many people are in junior and senior high school?

college : 20%

high
school : 30%

junior and senior high school :

For this case, we have that the total of people is 200.

If there are 20% of those people in the college, then we make a rule of three to determine the amount:

200 -----------> 100%

x ----------------> 20%

Where "x" represents the number of people who belong to the college.

So, we have 40 people belong to the school.

On the other hand, we use a rule of three to find the number of high school people:

200 ------------> 100%

y ----------------> 30%

Where "y" represents the number of people belonging to the high school.

So, we have 60 people belong to high school.

College: 40

High School: 60

60+40=100

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