Answer: decrease by $1,600
Step-by-step explanation:
Charlotte withdraws $8,000 from her account. When she first paid in that $8,000, the bank had to keep some of it as a reserve requirement. That requirement was that they keep 20%.
Now that she is withdrawing the money, the bank would have to retrieve that 20% from the reserve requirement in order to give it back to Charlotte.
That 20% is:
= 20% * 8,000
= $1,600