The average inflation rate in a country in each year from 2015 to 2020, relative to the previous year, was -0.59% (2015), -1.55% (2016), 1.34% (2017), 4.63% (2018), 3.83% (2019) and 2.63% (2020). Under these conditions, prices increased (keeping the first 2 decimal places after the decimal point) by: a) 9.58% in 2020 relative to 2014 b) 8.38% in 2020 relative to 2015 c) 7.50% in 2019 relative to 2016 d) 12.98% in 2020 relative to 2016