Estimate the change in economic value of equity if all market interest rates fall by an average of 1.5%. note that I have the solutions but how did they get average earning asset of 9.72%?

. Conduct DGAP analysis using the following information: Assets Amount Rate Macaulay's Duration Cash 0% 0 Bonds $23,000 $102,000 $375,000 7.2% 1.8 years 1.5 years 11.0% 3.6% 4.0 years Commercial loans Liabilities & Equity Small time deposits Large CDs Transactions accounts Equity 6.3% $130,000 $70,000 $250,000 $50,000 1.0 year 3.3 years 2.8% b. Using an average earning asset yield of 9.72%: A EVE = - - (-1.3385) [(-.015) / (1.0972)] 500,000 = -$9,149.43 . Conduct DGAP analysis using the following information: Assets Amount Rate Macaulay's Duration Cash 0% 0 Bonds $23,000 $102,000 $375,000 7.2% 1.8 years 1.5 years 11.0% 3.6% 4.0 years Commercial loans Liabilities & Equity Small time deposits Large CDs Transactions accounts Equity 6.3% $130,000 $70,000 $250,000 $50,000 1.0 year 3.3 years 2.8% b. Using an average earning asset yield of 9.72%: A EVE = - - (-1.3385) [(-.015) / (1.0972)] 500,000 = -$9,149.43