Among the following four months, for which month the contribution of the Apparel category in the total monthly sales was the highest?

The contribution of Apparel to Total Sales is calculated as:

$\text{Apparel contribution} = \dfrac{\text{Apparel sales}}{\text{Total sales of all categories}} \times 100\%$

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Let's find the total sales for each month by adding sales from all three categories:

Month	Apparel Sales	Footwear Sales	Electronics Sales	Total Sales
January	262	104	289	655
April	258	58	325	641
August	252	60	336	648
December	221	86	268	575

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Now let's calculate the exact contribution percentage for each month:

Month	Apparel Sales	Total Sales	Calculation	Contribution %
January	262	655	$\frac{262}{655} \times 100\%$	40.00%
April	258	641	$\frac{258}{641} \times 100\%$	40.25%
August	252	648	$\frac{252}{648} \times 100\%$	38.89%
December	221	575	$\frac{221}{575} \times 100\%$	38.43%

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Conceptual understanding:

Contribution percentage measures what portion of the total monthly revenue comes from the Apparel category.

Even though January had higher absolute Apparel sales (262 vs 258), April had proportionally lower sales from other categories, making Apparel's share of the total pie larger.

Therefore, April had the highest contribution of Apparel category to total monthly sales at 40.25%.