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Suppose it cost 50.75 Russian rubles (RUB) to buy one U.S. dollar (USD) one year ago. The exchange rate now is 66.44 RUB per USD.
Suppose it cost 50.75 Russian rubles (RUB) to buy one U.S. dollar (USD) one year ago. The exchange rate now is 66.44 RUB per USD. What is the approximately rate of change of the rubble relative to the dollar?
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