SOLUTION: The monthly salary of Mr. Johnson was ₦320,000 for each of the first three years. He then got an annual increment of ₦40,000 per month for each of the following successive 12 y

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Question 1210354: The monthly salary of Mr. Johnson was ₦320,000 for each of the first three years. He then got an annual increment of ₦40,000 per month for each of the following successive 12 years. His salary remained stationary till retirement when he found that his average monthly salary during the service period was ₦698,000.

Required:
(a) Prove that there is an Arithmetic Progression (AP) in the first 3 years of service.
(b) Compute the total salary in the first 3 years of service.
(c) Calculate the monthly and annual salary for the fourth year of service.
(d) Determine the monthly and annual salary for the ninth year of service.
(e) Find the total salary up to the 12th year of service.
(f) Obtain the total salary up to the 15th year of service.
(g) Find the monthly salary at the end of the 15th year of service.
(h) Compute the period of service.
Found 2 solutions by Edwin McCravy, ikleyn:
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!

The problem is botched.

 year           salary       average 
  1            ₦320000       ₦320000
  2            ₦320000       ₦320000
  3            ₦320000       ₦320000
  4            ₦360000       ₦330000
  5            ₦440000       ₦352000
  6            ₦560000       ₦386666.667
  7            ₦720000       ₦434285.714
  8            ₦920000       ₦495000
  9           ₦1160000       ₦568888.889
 10           ₦1440000       ₦656000
 11           ₦1760000       ₦756363.636

As you see, he could not have worked 11 years because if he had, he would
have already averaged more than ₦698,000 per month.

Sorry, but we cannot help you.  Get the right numbers and post the correct
problem.  Then we can help you.

Edwin

Answer by ikleyn(52775) About Me  (Show Source):
You can put this solution on YOUR website!
.

When I read this post, my impression and feeling are the same as if
I were driving a car whose wheels are shaped like squares or triangles.

I shudder at every word.

Absolutely anti-pedagogic way of writing Math problem in English.