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Exactly so. For many years, I could only buy ebooks in dollars (Baen, Fictionwise), so I tracked my spending in dollars. As I bought more ebooks in sterling, I applied an arbitrary 1.5 $:£ exchange rate to be able to keep my records consistent.
But now I buy nearly all my ebooks in sterling. So rather than add a sterling price column, I'd rather like to convert my historical prices to sterling as well. The 1.5 conversion rate will do fine. It will convert my pseudo dollar prices back to their actual sterling prices (+/- 1p), and it will be good enough for the dollar prices - the actual exchange rate has fluctuated over time, of course, but I'm not going to obsess that much over accurate figures!
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