Answer:
225%
Step-by-step explanation:
Find the difference between the two prices, then divide it by the original price:
78 - 24 = 54
54/24
= 2.25
So, the markup rate is 225%
y=kx
That's the formula for direct variation relationships!
The other two answers are nonsense and don't mean anything.
(x,y)=(4,-1/2)
Answer: It might be 4.2
