Question

Sn=45450,r=3.6,n=6

Answer 1

you should include a little more info.

I guess you want the geometric series defined like so:

S = a*(1 - r^n)/(1 - r)
45450 = a* ( 1 - (6^3.6) / 1 - 3.6
45450 = a *(1 - 632 .9) / -2.6
45450 = a* (-631.9) / -2.6
45450 = 243a
a= 187.04