Applying the tangent ratio, the angle of elevation of the sun, to the nearest degree, is: 36°.
<h3>What is the Tangent Ratio?</h3>
In a right triangle, tan ∅ = opposite length / adjacent length is the tangent ratio.
Given the following:
- Angle of elevation = ∅
- Opposite length = 125 ft
- Adjacent length = 172 ft
Apply the tangent ratio:
tan ∅ = 125/172
tan ∅ = 125/172
∅ = tan^(-1)(125/172)
∅ ≈ 36°
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0.71 dollars = 1 franc
1 dollar = 1/0.71 francs = 1.41 francs
Marginal Revenue is defined as the revenue generated with respect to increase in sale of another extra unit of product.
So we will calculate Marginal Revenue equation by finding the change in Revenue with respect to change in Quantity.
Given the Total Revenue Function as:-

Differentiating Total Revenue function (Tr) with respect to quantity (q):-
So Marginal Revenue equation will be, 
$79.24 rounded to the nearest ten would be $80.00, and 15% of that is $12.00.
Hope it helps!