Naturally occurring element T has three isotopes. Isotopes T-69 (68.92 amu) and T-71 (70.92 amu) have measured abundances of 60.10 % and 39.26 %, respectively. A third isotope, T-70 (69.92 amu), is present in trace amounts. The tabulated average atomic mass of T is 69.72 amu. Calculate the percent abundance of isotope T-70. Report your answer to two significant figures.