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10% off means to calculate the 10%, then subtract from the original {or you could first say 100% - 10% = 90%, then multiply the original by 0.9 [for 90%]}.

Take the first one: 15.99 x 0.1 = 1.599, now subtract from 15.99 = 14.391, which rounds to 14.39

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13y ago

What else can I help you with?