Answer:The formula you provided is for calculating the final value after a 100% decrease. Let's break it down: * fv: stands for "final value" * N: represents the original value * %D: represents the percentage decrease (in this case, 100%)The formula works as follows: * Subtract the percentage decrease from 100%: 100% - %D * Convert the result to a decimal: Divide the result by 100 * Multiply the original value by the decimal: N * (100% - %D)/100Example:If the original value (N) is 100 and the percentage decrease (%D) is 100%, then: * 100% - 100% = 0% * 0% / 100 = 0 * 100 * 0 = 0Therefore, the final value after a 100% decrease is 0.Note: A 100% decrease means the original value is completely reduced to zero.