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3800=0.04r+1600
We simplify the equation to the form, which is simple to understand
3800=0.04r+1600
We move all terms containing r to the left and all other terms to the right.
-0.04r=+1600-3800
We simplify left and right side of the equation.
-0.04r=-2200
We divide both sides of the equation by -00.04 to get r.
r=55000
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