SOLUTION: this problem is about inverse diviation, joint and combined According to Fidelity Investments, the average weekly allowence A of children varies directly as their grade level ,G

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Question 44016: this problem is about inverse diviation, joint and combined
According to Fidelity Investments, the average weekly allowence A of children varies directly as their grade level ,G. In a recent year allowence of a 9th grade student was $9.96 per week. What was the average weekly allowence of a 4th grade student?
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Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
First, write the equation of variation:
A+=+kG Where A is the weekly allowance, G is the student's grade level, and k is the constant of variation.
You will need to find the value of k. You can do this by substituting the given values of A and G into the above equation and solving for k.
9.96+=+k%289%29 Divide both sides by 9.
k+=+1.107
Now the equation of variation for your probem is:
A+=+1.107G
To find the average allowance of a 4th grade student, just substitute 4 for G in the preceeding equation and solve for A.
A+=+1.107%284%29
A+=+4.428 or $4.43