Considering 100% is achieved when the measurement is equal to the target, when the target is negative, it is necessary to define point 0%, since it cannot be when the measurement is 0, as 0 is greater than the target. Thus, the point 0 is twice the value of the target. Thus, the formula used to perform the calculation consists of: % = (MEASUREMENT - POINTZERO) / (TARGET - POINTZERO) * 100, IN WHICH POINTZERO = TARGET * 2.
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