Answer
914.633
Work Step by Step
Here $a=750.000$ and $r=0.18$
The summation is from $i=1$ to $n-1=7 \rightarrow n=8$
${\Sigma}750.000(0.18)^{i}=750.000(\frac{(0.18)^{8}-1}{0.18-1}) \approx 914.633$
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