Step-by-step explanation: According to the key, 4|0 means 40, which applies to any other stem and leaf on the chart. For example, on the chart, any numbers to the other side of the 8 are more than 0 which can be 8|2 or 8|5, so those count. 9|0 or 90, is way bigger than 80, so any numbers next to 90 count as well. I circled all the numbers that are correct, which is 12.
A Stem and Leaf Plot is a special table where each data value is split into a "stem" (the first digit or digits) and a "leaf" (usually the last digit).
Since the key says 4|0= 40 the answer to your question is 12. Twelve cleaners have more than 80 ingredients.