SOLUTION: When the average daily balance of a customer checking account falls below $500 in any week the bank access a $5 service charge. What must Friday balance be to avoid the service cha

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Question 1128156: When the average daily balance of a customer checking account falls below $500 in any week the bank access a $5 service charge. What must Friday balance be to avoid the service charge.
Monday $540.
Tuesday $455.50
Wed $365.50
Thur $330.
Found 3 solutions by MathLover1, ikleyn, MathTherapy:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Monday $540
Tuesday $455.50
Wed $365.50
Thur $330
Friday $x
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if the average daily balance of a customer checking account falls below $500 (means must be less then 500), then
$%28540%2B455.50%2B365.50%2B330%2Bx%29%2F5%3C500
$%28x+%2B+1691%29%2F5%3C500
$x+%2B+1691%3C500%2A5
$x++%3C2500-1691
$x++%3C809

Friday balance must be less than $809 to avoid the service charge.


Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
.

Certainly, the correct answer is 

     Friday balance must be NOT less than $809 to avoid the service charge.


Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

When the average daily balance of a customer checking account falls below $500 in any week the bank access a $5 service charge. What must Friday balance be to avoid the service charge.
Monday $540.
Tuesday $455.50
Wed $365.50
Thur $330.
Correct equation, with B being Friday's balance: matrix%281%2C3%2C+%28540%2B455.5%2B365.5%2B330%2BB%29%2F5%2C+%22%3E%22%2C+500%29

This should give you B, or a Friday balance that is