The output is the adjusted amount, rather than the percentage itself. Keep its unit from the starting figure: dollars remain dollars, kilograms remain kilograms, and points remain points. Add that unit when copying the answer elsewhere.
Percentage changes compound when applied repeatedly. Two 10% increases turn 100 into 121, not 120, because the second increase is based on 110. An increase and an equal decrease also do not cancel: 100 increased by 20% becomes 120, then a 20% decrease leaves 96.
Before applying a rate, check what the published percentage includes. A listed discount may apply before tax, a salary adjustment may exclude allowances, and a growth target may refer to volume rather than revenue. Apply several independent adjustments in the order they occur because each step creates a new base. For example, increasing 200 by 10% gives 220; reducing that by 5% gives 209. This differs from treating the rates as a single 5% increase, which would give 210. If a cap, minimum, or fixed fee also applies, calculate the percentage step first or last according to the stated rule. Write down each step when carefully checking a quotation or budget.
