On a planet similar to Earth, but in another solar system, the element potassium consists of three isotopes with the following relative abundances: 76.3% K-39, 16.4% K-38, and 7.3% K-40. Determine the molar mass of potassium on this planet if the mass of K-39 is 39.00 amu, K-38 is 38.00 amu, and K-40 is 40.00 amu.