financial maths again

[physics]

An initial amount of $30000 earns 7.65% pa with annual contribution of 10000 for the next 27 yrs. The retiremtn income comes froma  eprpituity fund offering 6.4%pa.

i use finance solver and used the first interest value and that gave me 1045385.84.
but then i have to multiply it by 0.064 to get the answer..but why?

i know that to get the first answer it is the amount after 27yrs for ur retiremtn but whats the 6.4%pa for and what does multiplying the answre mean?

THANKS