So I'm not totally sure but I got -15.32
So sorry if it's wrong!!
I think its 384 because if you multiply the two numbers underneath then you get 384 which is how they got all the other numbers
First we need to calculate the selling price after 50% increase
selling price = original cost + increase
selling price = 100% original cost + 50% original cost
selling price = 150% original cost
selling price = 1.5 × original cost
selling price = 1.5 × 30
selling price = 45
The selling price after getting a markup is $45
Second, we need to calculate the sale price after markdown 50%
Right now, we use $45 as the original price not $30 to count the sale price
sale price = original price - markdown
sale price = 45 - 50% × 45
sale price = 45 - 0.5 × 45
sale price = 45 - 22.5
sale price = 22.5
The sale price is not $30
To have a Proportionality equal to 1, you must have the same number in the numerator and denominator.
(D) y = x is your answer, because:
if y = 1, then x = 1, because of transitive property. And 1/1 = 1
if y = 2, then x = 2, because of transitive property. And 2/2 = 1
hope this helps
