do the assignment with C++

A company charges a customer every 4 months (3 times a year) for a service.

The cost every 4 months changes based on calls for the service.

Write a program to calculate the average yearly (12 months) cost.

The user should get a prompt to enter the 3 values for the year (just input a total cost for the 4 month period).

If the average monthly cost exceeds $150, the program displays The average charges are high!

If the average monthly cost is between $150 and $100, the program displays The average charges are Average!

If the average monthly cost less $100, the program displays The average charges are Low!