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b) (3 marks) The following table shows the monthly variations (in percentage) in the value of bitcoin at the closure of the first day of each month from January 2021 to May 2021. From To Variation in % January 1 February 1 +12.7% February March 1 +49.9% March 1 April 1 +19.1% April 1 May 1 -2.1% Find the average monthly variation (in percentage) in the value of bitcoin from January 1, 2021 to May 1, 2021. Round your answer to 1 decimal