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Well if it was increased from last year, then it must be dealing with devision to find out the price of last year...
So when you divide the number 287.50 by 15% You get to the total of:
<span>1 916.66667
</span>So your answer is: <em>$1,916.67 </em>
It would be 52% I believe
You can consider the tree perpendicular to its shadow, therefore you get a triangle rectangle of which you know the two legs and you need to find the angle between the shadow and the hypothenuse, opposite to the tree.
In this case, the angle α can be easily found with trigonometry:
tan α = (opposite side / adjacent side)
Therefore:
α = tan⁻¹ (tree / shadow) = tan⁻¹ (10 / 14) = 35°
NOTE:
tan⁻¹ is sometimes found written as arctan.
