The 5 Most-Repeated Percentage Question Types in ADRE
Type 1: Basic Percentage Calculation
Q: What is 15% of 240?
Trick: 10% = 24. 5% = 12. Total = 36. Done in 3 seconds!
Type 2: Percentage of One Number in Another
Q: 30 is what % of 150?
Formula: (30/150) x 100 = 20%
Type 3: Successive Percentage Change
Q: Price increased by 20% then decreased by 20%. Net change?
Formula: a + b + ab/100 = 20 + (-20) + (20 x -20)/100 = -4%. Answer: 4% decrease.
Type 4: Percentage Increase/Decrease
Q: Price rose from 400 to 500. % increase?
Increase = 100. % increase = (100/400) x 100 = 25%
Type 5: Finding the Original Value
Q: After 20% increase, price is 600. Original price?
120% of original = 600. Original = 600 x (100/120) = 500
Key Fraction-Percentage Table
Memorize these for ADRE speed: 1/2=50% | 1/3=33.33% | 1/4=25% | 1/5=20% | 1/8=12.5% | 1/10=10%