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Exercise / Problem	Formula
interests for 1 year	Z = K * p / 100
interests after multiple years "t"	Z = K * p * t / 100
interests after months "t"	Z = K * p * t / (100 * 12)
interests after days "t"	Z = K * p * t / (100 * 360)
compound interest Earnings "E" at a fixed annual interest rate "p" and "t" years	E = K * (1 + (p / 100))**t

• variables: p (interest rate), Z (amount of interest), K (capital), t (time), E (earnings)

gross / net / tare

Gross (lat. "brutus": impure) is a composite quantity which, reduced by certain parts, becomes net (ital: pure): x (net) + y (any) = z (gross). In the case of "y", this can be taxes, duties, volume, weights, etc.

Weight

Buying tomatoes in a package results in the following breakdown of individual weight designations: Tomatoes (net), package (tare), tomatoes and package (gross). The term "tare" is often used only for weights.

Incorrect calculation for prices

Many people make a crucial mistake in using the rule of three when calculating gross to net:

example: Calculate from 100,00 Euro (gross) the net amount.

Wrong	Right
100,00 Euro = 100 percent 1,00 euro = 1 percent 19,00 euro = 19 percent = 81,00 euro (net)	100,00 euro = 119 percent 0,84 euro = 1 percent 15,97 euro = 19 percent = 84,03 euro (net)
gross * 0,81 = net	gross / 1,19 = net

Note

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