Choice D is correct. It’s given that $a$ is $2,241 percent sign$ of the sum of $b$ and $c$ . This can be represented by the equation $a = (\frac{2,241}{100}) (b + c)$ , or $a = 22.41 (b + c)$ . It’s also given that that $b$ is $83 percent sign$ of $c$ . This can be represented by the equation $b = (\frac{83}{100}) c$ , or $b equals 0.83 c$ . Dividing both sides of this equation by $0.83$ yields $\frac{b}{0.83} = c$ . Substituting $StartFraction b Over 0.83 EndFraction$ for $c$ in the equation $a = 22.41 (b + c)$ yields $a = 22.41 (b + \frac{b}{0.83})$ , or $a = 22.41 (\frac{1.83 b}{0.83})$ , which is equivalent to $a = \frac{41.0103 b}{0.83}$ , or $a equals 49.41 b$ . This equation is equivalent to $a = (\frac{4,941}{100}) b$ ; therefore, $a$ is $4,941 percent sign$ of $b$ .

Choice A is incorrect and may result from conceptual or calculation errors.

Choice B is incorrect and may result from conceptual or calculation errors.

Choice C is incorrect and may result from conceptual or calculation errors.