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The atomic mass of an imaginary element X is 30.7377 amu. Element X has three isotopes. One isotope has an isotopic mass of 30.5734 amu and an abundance of 85%. Another isotope has an isotopic mass of 31.2892 and an abundance of 10%. The last isotope has an abundance of 5%. What is the isotopic mass of the last isotope? Round your answer to the nearest hundredth.