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The formula to find the principal is:
[tex]FV=P(1+i)^n[/tex]Where
FV is future value
P is principal
i is the rate of interest
n is the time frame
Given,
FV = 1300
i = r = 4%, or 4/100 = 0.04
n = t = 3
Plugging into formula and solving gives us:
[tex]\begin{gathered} FV=P(1+i)^n \\ 1300=P(1+0.04)^3 \\ 1300=P(1.04)^3 \\ P=\frac{1300}{1.04^3} \\ P=1155.695 \end{gathered}[/tex]Rounding to 2 decimal places:
$1155.70