Straight line method formula is depreciable amount / estimated useful life.
Plugging in our data from the problem above:
Â
 [(30,000,000 + 2,000,000) - 2,400,000
= ----------------------------------------------------
                       40 years
Â
  32,000 000 – 2,400,000
= ----------------------------------
              40 years
Â
    29,600,000
=Â ---------------
      40 years
Â
= 740,000 is the depreciation for the first full year.