Answer:
Since an economy produces two goods, X and Y, already a year ago the price of X was $ 4 and the price of Y was $ 6, while today the price of X is $ 8 and the price of Y is $ 10, what happened did not it is something other than an inflationary process, by which the values of goods have increased their value, both nominal and real, that is, both in monetary terms and in terms of the purchasing power of the individuals who develop in said economy.
Thus, good X went from being worth $ 4 to $ 8, which implies a change in nominal terms of $ 4, and in real terms an inflation of 100% year-on-year (8 x 100/4 - 100).
On the other hand, good Y went from being worth $ 6 to $ 10, with which nominally it also increased $ 4, but in real terms there was an inflation of 66.6% (10 x 100/6 - 100).