Answer: $50000
Explanation:
Based on the information that's been given in the question, firstly we need to calculate the excess reserves which will be:
= $4500 - (10% × $40000)
= $4500 - $4000
= $500
Then, the money supply that's expanded will be:
= Excess reserve / Reserve ratio
= $5000 / 10%
= $5000 / 0.1
= $50000
Therefore, the answer is $50,000.