C = $\dfrac{3}{5.8}$ + $\dfrac{5}{8.13}$ + $\frac{7}{13.20}$ + $\frac{9}{20.29}$
C = $\dfrac{8-5}{5.8}$ + $\dfrac{13-8}{8.13}$ + $\frac{20-13}{13.20}$ + $\frac{29-20}{20.29}$
C = $\dfrac{1}{5}$ - $\dfrac{1}{8}$ + $\frac{1}{8}$ - $\frac{1}{13}$ + $\dfrac{1}{13}$ - $\dfrac{1}{20}$ + $\frac{1}{20}$ - $\frac{1}{29}$
C = $\dfrac{1}{5}$ - $\frac{1}{29}$
C = $\dfrac{29}{145}$ - $\frac{5}{145}$
C = $\dfrac{24}{145}$
