Answer
$320$ cm
Work Step by Step
$S_∞ = a_1/(1-r)$
$a_1 = 80$
$r=.75$
$S_∞ = a_1/(1-r)$
$S_∞ = 80/(1-.75)$
$S_∞ = 80/.25$
$S_∞ = 80*4$
$S_∞ = 320$
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