$$2y \times 10^{ }$$
$20y$
$$2y\times 10$$
$$20y$$
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$20$
$$\frac{\mathrm{d}}{\mathrm{d}y}(2y\times 10)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(20y)$$
$$20y^{1-1}$$
$$20y^{0}$$
$$20\times 1$$
$$20$$