Answer
See below.
Work Step by Step
According to the exercise:
$a_1=8$
$a_2=5a_1=5(8)=40$
$a_3=5a_2=5(40)=200$
$a_4=5a_3=5(200)=1000$
$a_5=5a_4=5(1000)=5000$
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