If A is 200% more than B, then B is how much percentage less than A?
Let B = 100.
A is 200% more than B. Therefore $$B\times\frac{100 + 200}{100} = A$$
$$100\times\frac{300}{100} = 300$$
therefore A = 300.
To find how much percent B less than A,
$$300\times\frac{100 - x}{100} = 100$$
$$100 - x = \frac{100}{3}$$
$$x = 100 - \frac{100}{3}$$
$$x = \frac{200}{3}$$
$$x = 66.67$$
hence B is 66.67% less than A.
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