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A company is considering investing in a new piece of equipment to reduce the annual costs of producing its products. The new piece of equipment may operate 4 or 5 years. The annual savings may be $40,000, $50,000, or $60,000. The probabilities for each scenario is given in the following table:

Savings	Probability	Useful Life	Probability
$40,000	0.2	4 yrs	0.8
$50,000	0.7	5 yrs	0.2
$60,000	0.1

What is the joint probability of the investment saving $50,000 for 4 yrs?