A sale at a electronic store offers 20% off a sony radio. If the sale price of the radio is $45, what is the regular price?

0.8x = 45

x = 45 / 0.8
x = 56.25

$45 x .20% = $9

$45 + $9 = $54

.8 p = 45

p = 45/.8 = 56.25

Steve it is 20% from original full price, not 20% of final price.

To find the regular price of the Sony radio, we can use the concept of the sale price and the percentage discount given. Here's how you can calculate it:

1. Let's assume the regular price of the radio is represented by 'x'.

2. The sale price is given as $45, which is 20% off the regular price.

3. To find the sale price, we can calculate 20% of the regular price as follows:
20% of x = (20/100) * x

4. Since the sale price is $45, we can set up the equation:
(20/100) * x = $45

5. To solve for 'x', we need to isolate it. We can do this by multiplying both sides of the equation by 100/20:
x = ($45 * 100) / 20

6. Simplifying the equation:
x = $225 / 20

7. Dividing $225 by 20:
x = $11.25

Therefore, the regular price of the Sony radio is $11.25.