Taxpayer PT purchased $100,000 of corporate bonds yielding 12.5% per annum; the interest from these bonds is taxed at 21%. Taxpayer TG purchased $100,000 of municipal bonds yielding 9% per annum. These bonds have the same risk and maturity. What is the difference (in percent: 0.1=0.1% ) between after-tax rate of return earned by PT compared to TG (i.e., PT - TG), to the nearest 0.1 , with 5/4 rounding (do NOT include the "\%" in your response)