Flash Cards

Percentage change measures how much a value changed relative to the original. Positive = increase, negative = decrease.

💡 Successive changes of a% and b%: Net change = a + b + ab/100

Memorising key fraction-to-percent conversions saves crucial seconds on CAT. Use them in reverse for fast calculations.

💡 37.5% of 800 = 3/8 × 800 = 300 — fraction form is faster.

Profit = SP − CP. Loss = CP − SP. Percentage profit/loss is always calculated on Cost Price.

💡 If SP and profit% are given, CP = SP / (1 + P/100).

Shopkeepers mark up above CP (Marked Price), then offer a discount on MP to arrive at SP.

💡 If markup is m% and discount is d%, profit% = m − d − md/100.

In simple interest, interest is earned on the original principal only. It grows linearly with time.

💡 If you need to double your money at simple interest, Time = 100/R years.