No.
15 = 3 x 5
So for 200 to be a multiple of 15, it must be a multiple of both 3 and 5:
Thus 200 is a multiple of 5, but not a multiple of 3; so it is not a multiple of 15.
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The Least Common Multiple (LCM) for 100 and 200 is 200.
200 - 15% = 200 - 15% of 200 = 200 - 30 = 170
15% of 200 = 15% * 200 = 0.15 * 200 = 30
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