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Yes, it it the law.
You have not mentioned the area in which you are stationed. I suppose at age of 86 your mother in law shold be enjoying old age.
ironically, 86
30 percent off 86 dollars = $60.20
30% off of $86
= 30% discount applied to $86
= $86 - (30% * $86)
= $86 - (0.30 * $86)
= $86 - $25.80
= $60.20
The LCM is 86.