The price is written above each bar. Look for the smallest one first, then the biggest.
The year is the number below the bar. Write down both years.
The profit per sack is the biggest price minus the smallest price.
Example
For parents
What does this exercise practice?
The grain market trains reading a bar chart and finding the biggest and smallest value.
Common pitfalls
Price and year are easily mixed up. The price is above the bar, the year below it.
How to practice at home
Note down what a roll costs for a week. On which day was it cheapest?