To solve this problem, we just have to evaluate the formula.
[tex]A=\frac{k-e}{t}[/tex]Let's use these values, k = 22, e = 11, and t = 35.
[tex]A=\frac{22-11}{35}=\frac{11}{35}\approx0.314[/tex]But, we have to multiply it by 100 to express it as a percentage.
[tex]0.314\times100=31.4[/tex]