A firm has to decide whether to (1) stay with current machine as it is, or (2) upgrade it with an enhancement, or (3) buy a new machine. Cost of upgrade is $1000, and the cost of a new machine is $8000. Revenues are estimated as follows, based on the performance of the economy next year:

	stagnant economy	growth economy
no change	8000	8000
upgrade	8500	10000
new machine	8500	18000

It is estimated that the probability of a stagnant economy next year is 0.52 (so probability of a growth economy is 1 - 0.52).

What is the expected payoff(= revenue - cost of new machine) of buying the new machine?