How to calculate percentage of a number?+
To find X% of a number Y: Formula = (X ÷ 100) × Y. Example: What is 15% of 800? = (15 ÷ 100) × 800 = 0.15 × 800 = 120. So 15% of 800 = 120.
How to calculate percentage change?+
Percentage Change = [(New Value – Old Value) ÷ Old Value] × 100. If positive, it's a percentage increase; if negative, it's a decrease. Example: Price increased from ₹500 to ₹600. Change = [(600–500) ÷ 500] × 100 = (100 ÷ 500) × 100 = 20% increase.
How to calculate percentage marks?+
Percentage Marks = (Marks Obtained ÷ Maximum Marks) × 100. Example: You scored 450 out of 600. Percentage = (450 ÷ 600) × 100 = 75%. For multiple subjects, add all marks obtained and divide by total maximum marks.
What is the percentage of profit and loss?+
Profit % = (Profit ÷ Cost Price) × 100. Loss % = (Loss ÷ Cost Price) × 100. Example: Bought item at ₹200, sold at ₹250. Profit = ₹50. Profit % = (50 ÷ 200) × 100 = 25% profit. Always calculate profit/loss percentage on the cost price (CP), not selling price.
How to reverse calculate percentage (find original from percentage)?+
If you know the final value after a percentage increase: Original = Final Value ÷ (1 + Rate/100). Example: After 20% increase, price is ₹1200. Original = 1200 ÷ 1.20 = ₹1000. After 20% decrease, price is ₹800. Original = 800 ÷ 0.80 = ₹1000.
How to calculate GST percentage?+
To find GST amount from an inclusive price: GST Amount = (Inclusive Price × GST Rate) ÷ (100 + GST Rate). Example: A product MRP is ₹590 inclusive of 18% GST. GST = (590 × 18) ÷ 118 = 10620 ÷ 118 = ₹90. So base price = ₹500, GST = ₹90.