Discount

Marked Price and discount percentage relationships, including successive discounts — a direct extension of Profit and Loss.

📖 ~4 min read 📐 RRB NTPC / Group D — Mathematics

Core Terms

Marked Price (MP): The price displayed/listed on an item before discount
Discount: MP − SP
Discount is always calculated on Marked Price, NOT Cost Price

Core Formulas

Quantity	Formula
Discount %	(Discount / MP) × 100
SP from MP and Discount%	SP = MP × (100 − Discount%)/100

Successive Discounts

Net discount % for two successive discounts a% and b% = a + b − (a×b)/100

💡 Example: Two successive discounts of 20% and 10% = 20 + 10 − (20×10)/100 = 30 − 2 = 28% net discount.

Key Trap

⚠️ Profit/Loss % is calculated on Cost Price; Discount % is calculated on Marked Price — mixing up the two bases is the most common error in this chapter.

← Back to Profit and Loss Next Chapter → Simple Interest

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