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Induced EMF

A 5.80 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.770 T pointing up. During the course of 0.140 s, the field is changed to one of 0.240 T pointing down. What is the average induced emf in the coil?

and here's how i tackled it:

E=-N(change in magnetic flux/change in time)

change in magnetic flux = B2A - B1A = A(B2-B1) = 0.058^2pi(.770 - 0.140)

change in time = 0.140 s

N = 1

So I get..

E= 0.0100 V

Apparently that's wrong. Any suggestions ?