Double bar graph: Sales in $2022$ for shops $X,Y,Z$ were $100, 120, 80$ and in $2023$ were $130, 110, 90$.…

Double bar graph: Sales in $2022$ for shops $X,Y,Z$ were $100, 120, 80$ and in $2023$ were $130, 110, 90$. Which shop showed the largest increase from $2022$ to $2023$?
  1. $X$
  2. $Y$
  3. $Z$
  4. All same

Solution

Changes: $X: 130-100 = +30$, $Y: 110-120 = -10$, $Z: 90-80 = +10$. Largest increase is $X$.

Asked in: IMO

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