sure...
using pemdas (perenthesis exponent...u get the point)
inside the parenthesis there is nothing to simplify so you jump to the exponent step
and yes there is an exponent, so (1.08)^20 is 4.66095714385
then you just multiply by 100 for the last step getting you 466.095714385.
(just move the decimal 2 places to the right