Discussion
As the price of a book is reduced by 20%, then its consumption is increased by 25%. How much percentage difference is there in the previous income ?
Answer: D
There is 0 percent difference.
Income (spending) is price times quantity. Taking the old price and quantity as 100 each:
\[ \begin{aligned} \text{new} &= 0.80 \times 1.25 \\ &= 1.00 \end{aligned} \]
The 20% fall in price is exactly offset by the 25% rise in consumption, so the income is unchanged. The other options come from adding or subtracting the percentages directly (25 - 20 = 5 is not even offered) or from quoting one of the two changes.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development