A £105 item is reduced 15%, then a further 25% off the new price. What is the final price?

Apply each step as a multiplier in sequence (× (1 + markup), then × (1 − discount)); they don't net off additively. The correct answer is £66.94. Traps to avoid: £89.25 comes from the "one discount only" error; £65.00 comes from the "subtracted raw" error; £111.56 comes from the "second as increase" error; £63.00 comes from the "added the discounts" error.