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Basic Maths Formula

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BASIC MATHS FORMULA Average formula:   Let a 1 ,a 2 ,a 3 ,......,a n  be a set of numbers, average = (a 1  + a 2  + a 3 ,+......+ a n )/n Fractions formulas:   Converting an improper fraction to a mixed number: Formula for a proportion:   In a proportion, the product of the extremes (ad) equal the product of the means(bc),  Thus, ad = bc Percent:   Percent to fraction: x% = x/100 Percentage formula: Rate/100 = Percentage/base Rate: The percent.  Base: The amount you are taking the percent of. Percentage: The answer obtained by multiplying the base by the rate Consumer math formulas:   Discount = list price × discount rate Sale price = list price − discount Discount rate = discount ÷ list price Sales tax = price of item × tax rate Interest = principal × rate of interest × time Tips = cost of meals × tip rate Commission = cost of service × commission rate Geometry formulas:   Perimeter : Perimeter of a square : s + s + s + s  s:length o