Question

The atmospheric concentration of carbon dioxide increased from 278 ppm in 1790 to 383 ppm in 2007. What is the approximate percent increase in carbon dioxide concentration from 1790 to 2007?
A. 38%
B. 505
C. 92%
D. 105%
E. 138%

Answer 1

Answer:

A. 38%

Explanation:

Percentage increase = (Increase/original  value)×100

P.I.C= (ΔC/C₁)×100 .................. Equation 1

Where P.I.C = Percentage increase in the concentration of carbon dioxide from 1790 to 2007, ΔC = increase in the concentration of carbon dioxide from 1790 to 2007,

C₁ = concentration of carbon dioxide in 1790.

But,

ΔC = C₂ - C₁............................. Equation 2

Substituting equation 2 into equation 1.

P.I.C = [(C₂ - C₁)/C₁]×100.................... Equation 2

Given: C₁ = 278 ppm, C₂ = 383 ppm

Substituting into equation 2

P.I.C = [(383-278)/278]×100

P.I.C = (105/278)×100

P.I.C = 37.77%

P.I.C ≈ 38%

The right option is A. 38%