We have
2009 = 328/(1 -r) multiply bth sides by (1 -r0
2009 (1 - r) = 328
2009 - 2009r = 328 rearrange
2009 - 328 = 2009r
1681 = 2009r divide both sides by 2009
1681 / 2009 = r = 41 / 49