A book has been discounted 20% and now sells for $15. How much did it cost before the discount?
After we took off 20%, doesn't the $15 represent 80% of what it used to cost?
so .8x=15
x = 15/.8
= 18.75
test the answer by taking 20% of that, and subtracting it.
Do we get $15 ?
That is one of the choices so my guess is that that is correct. Thank you! =]
8=1/4x-6
To determine the cost of the book before the discount, we need to find the original price. Here's how we can do that:
Step 1: Calculate the discount amount
The book has been discounted by 20%. To find the discount amount, we can multiply the original price by the discount rate (expressed in decimal form). Let's assume the original price is represented by "x" in this case.
Discount Amount = x * 0.2
Step 2: Subtract the discount amount from the original price to find the sale price
The sale price is given as $15. We can set up the following equation:
x - (x * 0.2) = 15
Step 3: Solve the equation to find the original price
Rearranging the equation, we can simplify it:
x - 0.2x = 15
0.8x = 15
x = 15 / 0.8
By calculating the above equation, we find that:
x = 18.75
Therefore, the book originally cost $18.75 before the discount.