4. In 2025, the nominal interest rate on student loans is 15% per year, and both actual and expected inflation are equal to 7%. Time Period Nominal Expected Expected Actual Real Actual Interest Inflation Inflation Real Interest Interest Rate (% ) (% ) (% ) Rate {%) Rate (%) Before increase in MS 15 7 7 Immediately after 15 increase in MS (a) Complete the first row of the table by filling in the expected real interest rate and the actual real interest rate before any change in the money supply. (b) Now suppose the government suddenly inject money into the system, causing the inflation rate to rise unexpectedly from 7% to 9% per year. Complete the second row of the table by filling in the expected and actual real interest rates for students immediately after the increase in the money supply (MS). (c) Explain the effects of the change in (b) on the students who took out a loan