1. **State the problem:** Ruby wants to convert £21 into euros using the exchange rate £1 = €1.14. 2. **Formula used:** To convert pounds to euros, multiply the amount in pounds by the exchange rate: $$\text{euros} = \text{pounds} \times \text{exchange rate}$$ 3. **Apply the formula:** $$\text{euros} = 21 \times 1.14$$ 4. **Calculate:** $$21 \times 1.14 = 23.94$$ 5. **Answer:** Ruby will get €23.94 for £21.