A store buys a sweater for $15.00. They mark it up and sell it for a retail price of $20.00. What was percentage they marked it up?

option 1 is correct.

step-by-step explanation:

y varies inversely with x and constant of variation is 4

the equation will be:

y = k/x

where k =4 so,

y = 4/x

if we put values of x of option 1 in the above equation and find values of y

y = 4/-2 => y =-2

y = 4/-1 => y = -4

y = 4/1 => y = 4

y = 4/2 => y =2

so, all the values of x and y are correct.

if we put values of x given in other options and find value of y we cannot find whole table satisfying the equation.

hence option 1 is correct.

step-by-step explanation:

l.jnl.j/n.m,lm,

step-by-step explanation:

i use my brain for prombles like this maybe you could try it

step-by-step explanation: