Question-Expanded Form of Decimals(Grade-4)

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What is the expanded form for the following number?
27.9

	2×10 + 7×1 + 9×(0.00001)
	2×10 + 7×1 + 9×(0.01)
	2×10 + 7×1 + 9×(0.1)
	2×10 + 7×1 + 9×(0.0001)

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