Easy question about series: starting salary of 15000 but w/ fixed annual pay rise d

bobix

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After considering the offer employer ask for different payment this has the same starting salary of 15000 but with the fixed annual pay rise $d.
find d if the total amount paid over 10 years (217500) is to be the same under the two schemes 67500


My answer is 15000*10 + 67500 *10 = 217500


The answer the end of the mei book is 1496

can someone help explaining this

thanks
 
After considering the offer employer ask for different payment this has the same starting salary of 15000 but with the fixed annual pay rise $d.
find d if the total amount paid over 10 years (217500) is to be the same under the two schemes 67500


My answer is 15000*10 + 67500 *10 = 217500


The answer the end of the mei book is 1496

can someone help explaining this

thanks
I think you will need a better translation. Guessing...

15
15+d
15+2d
15+3d
...
15+9d
-----------
And the total is?
 
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