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The average atomic mass of lithium is 6.941 amu. Lithium has two naturally occurring isotopes, 6Li (7.52%) and 7Li (92.48%). The mass of 6Li is 6.0151 amu. What is the mass of 7Li?

I dont know how to use this so,, here's my question: The average atomic mass of lithium is 6.941 amu. Lithium has two naturally occurring isotopes, 6Li (7.52%) and 7Li (92.48%). The mass of 6Li is 6.0151 amu. What is the mass of 7Li?