If a shirt selling for $ 18 is marked up to $20 then the percentage increased is equal to

11.11%

Step-by-step explanation:

the increased price = 20-18 = $2

the percentage increased = 2/18 ×100%

= 11.11%

Percent increase = 11.11%

Concept:

Here, we need to know how to find the percentage of increase.

Percent increase is a measure of percent change, which is the extent to which something gains value.

Percent increase = [(final value - initial value) / initial value] × 100%

Solve:

Given information

Initial value = $18

Final value = $20

Given expression

Percent increase = [(final value - initial value) / initial value] × 100%

Substitute values into the expression

Percent increase = [(20 - 18) / 18] × 100%

Simplify values in the parentheses

Percent increase = [2 / 18] × 100%

SImplify by multiplication

Percent increase = 11.11 % (Rounded to the hundredth place)

Hope this helps!! :)

Please let me know if you have any questions

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204