IF the rate of consumption of N2)4 (below) is .0221, what is the rate of production of NO2?

N2O4(g)<->2NO2(g)

Please help and explain. BC i have to actually understand how to do the problem.
Thanks

Sorry I typed it wrong i meant

IF the rate of consumption of N2O4 (below) is .0221 what is the rate of production of NO2?