2000/x = 60/100
Comparing fractions, if 2000 is 40% off, then 2000 is the remaining 60% of the price. Cross multiply, 2000 times 100 divided by 60 is 3333 + (1/3).
3333.33 is the original price, using only the first two decimals since it is dollar value.
To check, multiply this value to be 60% of the current value. If 3333.33 * 0.6 is nearly 2000 then you know that you have the right answer.
Another way to check is to take the current value of 3333.33 and do this
3333.33-(3333.33*0.4)
Because we are subtracting 40% of the value by first calculating the 40%, then subtracting it.