Step 1
Percentages
Percentage = part ÷ whole × 100. Percentage change = (new − old) ÷ old × 100.
Step 2
Finance
Fixed payments use principal, periodic interest rate, and total payment count. Compound growth raises one plus the periodic rate to the number of periods.
Step 3
Science
Common relationships include F = ma, v = d/t, density = mass/volume, molarity = moles/litres, and pH = −log₁₀[H⁺].