The element gallium has an atomic weight of 69.7 and consists of two stable isotopes gallium - 69 and gallium - 71. The isotope gallium - 69 has a mass of 68.9 amu and a percent natural abundance of 60.4 %. The isotope gallium - 71 has a percent natural abundance of 39.6%. What is the mass of gallium - 71?
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