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notashley1703
24.06.2021 •
Mathematics
(m+n)^2 - (m-n)^2 = 16 then mn is
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Ответ:
mn = 4
Step-by-step explanation:
(m+n)^2 = m^2 + 2mn + n^2
(m-n)^2 = m^2 - 2mn + n^2 multply the second equation by (-1) then subtract it from first equation
m^2 + 2mn + n^2 - m^2 + 2mn - n^2 = 16
4mn = 16 divide both sides by 4
mn = 4
Ответ:
Number of shirts a department store bought = 200
Cost price of 200 shirts = $5400
Cost price of 1 shirt :
Thus, the cost price of one shirt = $27
Price at which the department store sold each shirt = $30
Which means :
▪︎Cost price of shirt = $27
▪︎Selling price of shrit = $30
Since selling price is greater than cost price, there was a markup in the price of the shirts.
We know that :
Markup percentage in the price of the shirts :
Thus, the percentage of markup =![\tt 11.1 \%](/tpl/images/1121/4760/2971e.png)
Therefore, the percentage of markup in the shirt's price =![\color{hotpink} \tt11.1 \%](/tpl/images/1121/4760/c8dd6.png)