Average EMF of adjustable single loop

The cross-sectional area of an adjustable single loop isreduced from 1.0m^2 to 0.75m^2 in 0.10s.What is the averageemf that is induced in this coil if it isin a region where B=2.0Tupward, and the coil's plane is perpendicular to B?Thanks for all the help!Its finals week and I just needmega help!Thanks again!