Myers Business Systems is evaluating the introduction of a new product. The possible levels of unit sales and the probabilities of their occurrence are given next:

Possible Market Reaction Sales in Units Probabilities

Low response $200\mathrm{.}10$

Moderate response $400\mathrm{.}30$

High response $550\mathrm{.}40$

Very high response $700\mathrm{.}20$

What is the expected value of unit sales for the new product?