Can I Use Rates Instead of Rate Constants in an Arrhenius Plot?

[mycotheology]

Heres the question:
http://img215.imageshack.us/img215/1185/screenshot5xq.png
Kinetics is probably my weakest area in chemistry so I'm struggling. To find the shelf life, I need to use the Arrhenius equation but I don't know the activation energy Ea or the A constant. So I converted 2 those percentages into rates and got:
At 40C, rate = 0.082 %/month
At 60C, rate = 0.39 %/month
I know that if I plot 1/T vs. lnk, I get an Arrhenius plot and then I can find Ea from the slope and A from the y-intercept but I don't have k. Can I just use the rates that I have instead of k?

 

[Borek]

You have two data points and two unknowns, that means you should be able to find both solving system of two equations.

 

[mycotheology]

Can you elaborate on that a bit. Do you mean use simultaenous equations?

 

[Borek]

Yes.