Answer:
Refer to the explanation.
Explanation:
Let's take each one at a time.
1.
To solve for the complement, we simply subtract our markup rate by 100%.
100% - 30% = 70%
Now to solve for the selling price, we use the formula
![SellingPrice=(Cost)/(ComplementOfMarkupRate)](https://img.qammunity.org/2020/formulas/mathematics/high-school/qauiwt44idk6y6pt48yonbtx4q5itkjiov.png)
![SellingPrice=(86.74)/(0.70)](https://img.qammunity.org/2020/formulas/mathematics/high-school/xebnb0tq15mi3iqj7fjgm67fphrg4d1wv8.png)
Selling Price = $123.91
2.
We do the same process with the first number.
100% - 40% = 60%
![SellingPrice=(Cost)/(ComplementOfMarkupRate)](https://img.qammunity.org/2020/formulas/mathematics/high-school/qauiwt44idk6y6pt48yonbtx4q5itkjiov.png)
![SellingPrice=(220.00)/(0.60)](https://img.qammunity.org/2020/formulas/mathematics/high-school/klx59j7pqfa7i5r5lpsrylx1q41qs733i7.png)
SellingPrice = $366.67
3.
The same as the first two.
100% - 20% = 80%
![SellingPrice=(Cost)/(ComplementOfMarkupRate)](https://img.qammunity.org/2020/formulas/mathematics/high-school/qauiwt44idk6y6pt48yonbtx4q5itkjiov.png)
![SellingPrice=(89.50)/(0.80)](https://img.qammunity.org/2020/formulas/mathematics/high-school/7txf1ilmzk65b6wpgzcyznsfoxo8pt359d.png)
SellingPrice = $111.88
4.
Now to solve for the markup rate, we use the formula:
![MarkupRate=(Markup)/(SelingPrice)](https://img.qammunity.org/2020/formulas/mathematics/high-school/95w4nwy715qq9wb4opap5xf8r6qitedek4.png)
In this case we first need to find the markup. The markup is the difference between the selling price and the cost.
Selling Price = $235.28
Cost = $199.99
Markup = $235.28 - $199.99
Markup = $35.29
Now the we know our markup, we can then solve for the markup rate using the formula.
![MarkupRate=(Markup)/(SelingPrice)](https://img.qammunity.org/2020/formulas/mathematics/high-school/95w4nwy715qq9wb4opap5xf8r6qitedek4.png)
![MarkupRate=(35.29)/(235.28)](https://img.qammunity.org/2020/formulas/mathematics/high-school/mvsrf3428yafqivyaafbo0v0ddj6z9q12g.png)
MarkupRate = 0.1499 x 100 = 14.99% or 15%
5.
Now for the last one, we need to find for the cost. Let's use the selling price formula to find for the cost.
![SellingPrice=(Cost)/(ComplementOfMarkupRate)](https://img.qammunity.org/2020/formulas/mathematics/high-school/qauiwt44idk6y6pt48yonbtx4q5itkjiov.png)
Selling Price = $30.77
Complement = 65% or 0.65
This will then give us.
![30.77=(Cost)/(0.65)](https://img.qammunity.org/2020/formulas/mathematics/high-school/8ytrshfzaqlc8i1qphz3n2p3crhuip0xlc.png)
We multiple both sides of the equation by 0.65 to leave our cost alone.
30.77 x 0.65 = Cost
Cost = $20