human
A store offers a discount on purchasing three shirts together for $45. If the original price of each shirt is x dollars and the discount rate is y%, what is the cost of one shirt before the discount?
gpt
Step 1: Understand the problem
We are given that the store offers a discount on purchasing three shirts together for $45. The original price of each shirt is x dollars and the discount rate is y%. We need to find the cost of one shirt before the discount.

Step 2: Write the equation
Let's represent the cost of one shirt before the discount as x. Since there is a discount on purchasing three shirts together, we can write the equation as:

3x * (1 - y/100) = 45

Step 3: Solve for x
To find the cost of one shirt before the discount, we need to solve for x. First, let's isolate x by dividing both sides of the equation by 3:

x * (1 - y/100) = 45 / 3
x * (1 - y/100) = 15

Now, we need to solve for x in terms of y:

x = 15 / (1 - y/100)

Step 4: Final answer
The cost of one shirt before the discount is:

x = 15 / (1 - y/100)