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 ?
(a)21\%
(b)30\%
(c)35\%
(d)39\%
(e)25\%
Answer
Answer (as printed): B
Explanation
Number of male athletes in 2006 from $C$ $$=(6.9 \times 100)=690 .$$ Number of male athletes in 2007 from C $$=(4.8 \times 100)=480 .$$ Decrease $\%=\left\{\frac{(690-480)}{690} \times 100\right\} \%=\left(\frac{210}{690} \times 100\right)$ $$=\frac{700}{23} \%=30.4 \% \simeq 30 \% \text { (nearly). }$$
Explanation as extracted from the printed page; notation may be imperfect.