If a pair of jeans cost £25 after a 25% increase, how much did they cost before the increase?

Hey there!

The price of the pair of jeans is now 125% of what it used to be. 125% is now going to be considered our new 100%, and 100% will now be considered 80% of the new price. I got 80% by dividing 100 by 125 to get 0.8. 

All we need to do is multiply our 80% (in decimal form by dividing the percentage by 100) by our new 125% price. 

80% = 0.8

$25.00 × 0.8 = $20.00

The old price before the increase was $20.00. 

Hope this helped you out! :-)