What is the approximate percentage decrease in the number of boys in School $D$ in the year 2008 as compared to that in the previous year ?
(a)17\%
(b)12\%
(c)9\%
(d)5\%
(e)23\%
Answer
Answer (as printed): A
Explanation
Number of boys in School $D$ in 2007 $$=(6.4 \times 100)=640 .$$ Number of boys in School $D$ in 2008 $$=(5.3 \times 100)=530 .$$ Decrease $\%=\left(\frac{110}{640} \times 100\right) \%=\frac{275}{16} \%=17.1 \% \simeq 17 \%$.
Explanation as extracted from the printed page; notation may be imperfect.