SOLUTION: When the average daily balance of a customer's checking account falls below $500 in any week, the bank assesses a $5 service charge. The table shows the daily balances of one custo

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Question 84320This question is from textbook elementary algebra
: When the average daily balance of a customer's checking account falls below $500 in any week, the bank assesses a $5 service charge. The table shows the daily balances of one customer. What must Friday's balance be to avoid the service charge?
Monday $540.00
Tuesday $435.50
Wednesday $345.30
Thursday $310.00
Thanks for your help.This question is from textbook elementary algebra

Answer by tutor_paul(427) About Me  (Show Source):
You can put this solution on YOUR website!
Another way to think about this question is:
"What must Friday's balance be for the average daily balance of the account to be $500/"
You can set up the equation like this:
%28540%2B435.5%2B345.3%2B310%2Bx%29%2F5=500
Where x is the Friday balance. Now just solve for x:
%281630.8%2Bx%29%2F5=500
1630.8%2Bx=2500
highlight%28x=869.20%29
Good Luck,
tutor_paul@yahoo.com