Isabelle has $84.00 in her account on Sunday. Over the next week, she makes the following changes to her balance via deposits and purchases: Day Debit ($) Credit ($) Monday 22.35 --- Tuesday 47.60 10.29 Wednesday 15.44 --- Thursday 11.25 --- Friday 9.78 22.69 Saturday 30.54 18.86 On which day or days does Isabelle get charged an overdraft fee? I. Thursday II. Friday III. Saturday

Start with $84.00 and apply each day’s debits and credits. After Wednesday, Isabelle has $8.90; Thursday’s $11.25 debit brings her balance to −$2.35, so she is overdrawn. Friday’s net change is a $12.91 increase, and Saturday’s net change is a $11.68 decrease, which leaves the balance below zero again. The correct choice is “I and III.”

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