Notes / SSC CGL / Quantitative Aptitude

CH 02

Percentage, profit & loss

Quantitative Aptitude · SSC CGL

Key points

  • Profit/loss is always calculated on CP; discount on MP.
  • Two successive changes a% and b%: net = a + b + ab/100.
  • Same SP, one item at x% profit and one at x% loss → always a loss of x²/100 %.

Formulas & facts

Profit %
(SP − CP) / CP × 100
Discount %
(MP − SP) / MP × 100
SI
P × R × T / 100
CI amount
P(1 + R/100)^T
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