Question

Ariel deposited $100 into a bank account. Each Friday she will withdraw 10% of the money in the account to spend. Ariel thinks her account will be empty after 10 withdrawals. Do you agree? Explain.

Answer 1

No. 10% of the money left changes after every withdrawal.

First day: 100×10%=10

Second day:90×10%=9

Third day:81×10%=8.1
.
.
.

Hence, she will never withdraw the $100 completely.