In 2004, wind turbines generated 326 MW of wind energy, and it is projected that the amount will be 10 000 MW per year by 2010. If this growth were modelled by a geometric sequence, determine the value of the annual growth from 2004 to 2010.

1 megawatt = 1,000,000 watts

My attempt: So, I think we solve for r (the ratio) so I plug in 10000=tn , 326=t1 , and 6 = n.

tn = (t1)(r^n-1)

10000 = (326)(r^6-1)

30.67484663 = r^5

1.98315 = r

The answer is 1.77; I was close... Can someone please tell me what I did wrong? Thanks!