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The pie chart presents the percentage contribution of different macronutrients to a typical $2,000$ $\mathrm{kcal}$ diet of a person.

The typical energy density $(\mathrm{kcal} / \mathrm{g})$ of these macronutrients is given in the table.
\begin{array}{|l|c|}
\hline \text{Macronutrient} & \text{Energy density (kcal/g)} \\
\hline \text{Carbohydrates} & 4 \\
\hline \text{Proteins} & 4 \\
\hline \text{Unsaturated fat} & 9 \\
\hline \text{Saturated fat} & 9 \\
\hline \text{Trans fat} & 9 \\
\hline
\end{array}

The total fat (all three types), in grams, this person consumes is

  1. $44.4$ 
  2. $77.8$ 
  3. $100$
  4. $3,600$

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