If the value of a car decreased by 10 percent and is now worth $ 21,000. What was the original cost of the car?

Do this problem the same way I showed you for your other problem.

To find the original cost of the car, we can use the concept of percentage decrease.

Let's assume the original cost of the car is represented by the variable 'x'.

Since the car's value decreased by 10%, this means it is now worth 90% of its original cost.

We can set up the following equation to find 'x':

90% of 'x' = $21,000

To solve this equation, we can convert 90% to decimal form by dividing it by 100:

0.9x = $21,000

Now we can isolate 'x' by dividing both sides of the equation by 0.9:

x = $21,000 / 0.9

Calculating this, we find that the original cost of the car was $23,333.33 (rounded to the nearest cent).

Therefore, the original cost of the car was approximately $23,333.33.