The reserve requirement is​ 10%.  

Suppose that Jack transfers ​$30,000 from an account at First Bank to a checking account at Second Bank. Second​ Bank's total reserves will increase by ​$--- . Of​ that, Second Bank is required to hold--- in​ reserves, and thus can loan out a maximum of ​$---.
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Second​ Bank's total reserves will increase by $30,000.

Of​ that, Second Bank is required to hold 10% in​ reserves, which would be $3,000.

Therefore, Second Bank can loan out a maximum of $27,000 ($30,000 - $3,000).

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First, we need to calculate the total reserves increase for Second Bank.

Second Bank's total reserves will increase by the amount transferred by Jack, which is $30,000.

Next, we need to calculate the amount that Second Bank is required to hold in reserves. The reserve requirement is given as 10%.

To calculate the required reserves, we multiply the transferred amount by the reserve requirement:
Required Reserves = $30,000 x 10% = $3,000.

Finally, we can calculate the maximum loanable amount for Second Bank, which is the remainder after deducting the required reserves from the total reserves increase:
Maximum Loanable Amount = Total Reserves Increase - Required Reserves = $30,000 - $3,000 = $27,000.

Therefore, Second Bank's total reserves will increase by $30,000. Of that, Second Bank is required to hold $3,000 in reserves, and thus can loan out a maximum of $27,000.

To find out how Second Bank's total reserves will increase after Jack transfers $30,000 from First Bank, we need to calculate the reserve requirement and the maximum loanable amount.

Given that the reserve requirement is 10%, we can first calculate the increase in reserves by multiplying the transfer amount by the reserve requirement:

Increase in reserves = $30,000 * 10% = $3,000

So, Second Bank's total reserves will increase by $3,000.

Now, let's find out how much of that increase Second Bank is required to hold in reserves. If the reserve requirement is 10%, then Second Bank must hold this percentage of the increase in reserves:

Reserves required = Increase in reserves * Reserve requirement = $3,000 * 10% = $300

Therefore, Second Bank is required to hold $300 in reserves.

Finally, the maximum loanable amount can be calculated by subtracting the required reserves from the increase in reserves:

Maximum loanable amount = Increase in reserves - Reserves required = $3,000 - $300 = $2,700

Hence, Second Bank can loan out a maximum of $2,700.