Eduqo
Quantitative Aptitude›Ch 5: Data & Speed Maths›Data Interpretation: Tables
Master reading, percentage change, and ratios in tabular data
Always read table headings, units, and years carefully before calculating percentage change, ratios, or averages.
Quick Memory Hooks
| Year | Store A | Store B |
|---|---|---|
| 2021 | 40 | 50 |
| 2022 | 60 | 80 |
| 2023 | 90 | 100 |
Row-Column
(Find Intersection Cell)
Find Intersection Cell
Row 2 and Column 3 gives the exact data point.
% Increase
(Compare Two Values)
Compare Two Values
Growth from 40 to 60 is 50 percent increase.
Ratio
(Simplify Division)
Simplify Division
Ratio of 50 to 100 simplifies to 1:2.
Average
(Balance All Data)
Balance All Data
Sum of 40, 60, 90 divided by 3 gives average.
Using new value as base for % changeAlways use original/old value as base
Base value is critical. Using current year instead of previous year is the #1 negative marking trap.
Forgetting table scale units like 'in lakhs'Multiply final answer by given unit scale
If data is given in thousands, 50 means 50,000. Do not miss scale multipliers.
Calculating average of percentages directlyFind total sum first, then divide by count
Never average percentage rates directly unless bases are equal. Always use absolute values.
Q1.Using the table above, what is the percentage increase in Store A sales from 2021 (40) to 2022 (60)?
Q2.What is the average sales of Store B across the three years (50, 80, 100)?