Question

Calculate the percent decrease of CO concentration between 1980 and 2019. round your answer to the nearest whole percentage.

Answer 1

percent decrease = 86 %

Step-by-step explanation:

percent decrease = (decrease in ppm ÷ initial ppm) × 100

where the initial ppm is in the table , is the concentration in 1980, and the decrease in ppm comes from this calculation

initial ppm - decrease in ppm = current ppm

9 - decrease in ppm = 1.3

9 - 1.3 = decrease in ppm

7.7 = decrease in ppm

percent decrease = (decrease in ppm ÷ initial ppm) × 100

percent decrease = (7.7 ÷ 9) × 100 = 85.6