Q:   A star in the halo of the Milky Way has [M/H] = -0.6.
          How different is its fraction of heavy elements compared
          to the Sun's?


              a)  about 0.50 of the Sun's value
              b)  about 0.36 of the Sun's value
              c)  about 0.25 of the Sun's value
              d)  about 0.05 of the Sun's value



   
           10^(-0.6)  =  0.25,  so "c" is the closest option