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Sample Question 7:
Mary is \(20\%\) older than Sally, and Sally is \(40\%\) younger than Danielle. The sum of their ages is \(23.2\) years. How old will Mary be on her next birthday?
\(\mathrm{(A) \ } 7\qquad \mathrm{(B) \ } 8\qquad \mathrm{(C) \ } 9\qquad \mathrm{(D) \ } 10\qquad \mathrm{(E) \ } 11\)