Concept: Area is the product of length and width. Therefore, in calculation of area, we should know about the product rule of uncertainty. It states, in case of product, the percentage uncertainties of the terms to be multiplied (length and width in this case) are added. So, first we find the percent uncertainties in the measurement of length and breadth of the rectangular sheet. Then we will add the sum of these percentage uncertainties with the product of the length and width. This will give us the percentage uncertainty of the area. Then we convert the percentage uncertainty in fractional uncertainty and add with the product. Therefore,
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