3. How much did the US dollar exchange rate change over the 2014 year (from January 1, 2014 to December 31, 2014)? Give the answer in rubles, rounding to the nearest whole number (the answer is a whole number).
Answer: 24. On January 1, 2014, the dollar was worth 32.6587, and on December 31, it was 56.2584.

$56.2584-32.6587=23.5997$. Since rounding was required, the answer is 24.

Note: This problem could have been solved using the internet. For example, the website https://news.yandex.ru/quotes/region/1.html