Let's call the original price of the refrigerator "x".
According to the problem, the sale price of the refrigerator was $600, which was three-fifths of the original price.
We can set up an equation to represent this:
3/5 x = 600
To solve for x, we can multiply both sides by the reciprocal of 3/5, which is 5/3:
x = 600 * 5/3
Simplifying:
x = 1000
Therefore, the original price of the refrigerator was $1000.