Final answer:
The CD is cheaper when bought in the US in 2017 at $12.07 compared to £9.50 in London. The MP3 player is cheaper in dollars when bought in the US in both 2008 and 2017, with prices of $25.20 and $16.00 in the UK, respectively.
Step-by-step explanation:
To determine which currency is cheaper, we need to convert the prices to a common currency. Let's convert the price of the CD from pounds to dollars using the exchange rate from 2008 and 2017.
In 2008, 1 British pound was worth $2.00. So, the CD price of £9.50 can be converted to dollars by multiplying it by the exchange rate: £9.50 × $2.00 = $19.00.
In 2017, 1 British pound was worth $1.27. So, the CD price of £9.50 can be converted to dollars using the exchange rate: £9.50 × $1.27 = $12.07.
Therefore, the CD is cheaper when bought in the US in 2017, as it costs $12.07 compared to $19.00 in London.
Now, let's convert the price of the MP3 player from euros to dollars using the exchange rate. The price in euros is €20.46, and the exchange rate is £1 = €1.17. To convert this price to pounds, we can divide it by the exchange rate: €20.46 / 1.17 ≈ £17.51.
Next, let's convert the price in pounds to dollars using the exchange rate from 2008 and 2017.
In 2008, 1 British pound was worth $2.00. So, the price of £12.60 can be converted to dollars using the exchange rate: £12.60 × $2.00 = $25.20.
In 2017, 1 British pound was worth $1.27. So, the price of £12.60 can be converted to dollars using the exchange rate: £12.60 × $1.27 = $16.00.
Therefore, the MP3 player is cheaper in dollars when bought in the US in both 2008 and 2017, as it costs $25.20 and $16.00 in the UK, respectively.