What was the approximate percentage decrease in the number of male athletes who participated from Country C in the year 2007 as compared to the previous year?

Answer: Option B

  Number of male athletes in 2006 from C
  = 6.9 × 100
  = 690
  Number of male athletes in 2007 from C
  = 4.8 ×100
  = 480
$$\begin{array}{rl}& \therefore \text{Decrease }\%\\ & =\left(\frac{690-480}{690}\times 100\right)\%\\ & =\left(\frac{210}{690}\times 100\right)\%\\ & =\frac{700}{23}\%\\ & =30.4\%\\ & \approx 30\%\end{array}$$