Percentage (Aptitude) YouTube Lecture Handouts for Olympiad
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Watch Video Lecture on YouTube: Percentage Basics  1 Key Trick (For Aptitude): Working and Thinking in Relative Quantities
Percentage Basics  1 Key Trick (For Aptitude): Working and Thinking in Relative Quantities
Relative Quantities Fractions, Rations & Percent
Addition & subtraction
Key Ideas

Fractions, Rations and percent relative quantities

Relative quantities and absolute quantities are not to be mixed.

Relative quantities can be added or subtracted

x represents the unknown in the relative quantity.
What Percent is 60 of 240?
25
Find Sales Tax @ 20% from a Gross Figure of Rs. 1600?
320
If 50% of (XY) = 30% of (X+Y), then What Percent of X is Y
25%
If 10% of a number is added with itself then result becomes 1331. Find the original number.
1210
60% of a Number is 360. What is 99 % of the Same Number?
594
If 15% of a Number is Subtracted from Itself then Result Becomes 2550. Find the Original Number
3000
If 39 is Added in a Number, It Becomes 113 % of Itself. Find the Number
339
A House Sold for 357000 Dollars, Produces a Profit of 19%, Find the Profit?
57,000
40% of 70 is What % More Than 30% of 80?
16.66%
A Fruit Seller Had Some Apples. He Sells 40% Apples and Still Has 420 Apples. Originally, He Had?
700
If a = X% of Y and B = Y% of X, Then

X > Y

A > B

Y < X

A = B
A Number Exceeds 20% of Itself by 40. Find the Number?
50
A Man Multiplied a Number by 7/4 Instead of 3/5. What is % Error?
19.16%
The total salary of A and B is Rs. 1500. A spent 90% of his income and B spent 80% of his income. The ratio of saving is 3:4. Find the ratio of their salary. What is their absolute salary?
3:2 or 900:600
If a Exceeds B by 40%, B is Less Than C by 20%, then a: C Is
28:25
Next Class: % Change, Income & Consumption
The price of sugar decreases by 30%. By what % the consumption should increase so that expenditure decreases only by 10%?
A man spends Rs. 5700 from his income of Rs. 8550. If his income and expenditure are increased by 19% and 13%. Find the % change in saving?
Mayank