Answer:

x = 400

Step-by-step explanation:

We have, 250% × x = 1000

or,

250

100 × x = 1000

Multiplying both sides by 100 and dividing both sides by 250,

we have x = 1000 × 100

250

x = 400

If you are using a calculator, simply enter 1000×100÷250, which will give you the answer.