Suppose you deposit $ cash into your checking account. By how much will the total money supply increase as a result when the required reserve ratio is 0.0?

If the required reserve ratio is 0, that means that the money multiplier will be infinite. I guess the question is incomplete.

I looked for similar questions to fill in the blanks:

If you deposit $2,400 and the required reserve ratio is 0.4, then by how much does the money supply increase?

first we must determine the money multiplier = 1 / required reserve ratio = 1 / 0.4 = 2.5

to determine the total effect on the money supply we just multiply the deposit by the multiplier = $2,400 x 2.5 = $6,000 increase.

a is the correct answer, tell me if im right