Economic calculation question-help plz thank you?

Question

bank has zero excess reserves, with a required reserve ratio of 10 percent. If $100,000 in cash is withdrawn from the bank, it has a reserve deficiency of

$10,000.

$90,000.

$100,000.

$1,000,000.

Answer 1

10,000

Answer 2

b) $90,000.

Liabilities are reduced by 100'000, thus reserves may be reduced by

100'000*10%=10'000.

Deficit= 100'000 - 10'000 = $90'000