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Q23·CSAT · Prelims 2026

Quantitative — Percentage Balance Systems

NumericalPercentagesArithmetic Problem● Easy

Question

A person saves 10% of his salary every month. If his salary increases by 12% and the expenditure increases by 10%, then what will be the change in his saving per month?

Options

a

20% increase

b

30% increase

Answer
c

03% decrease

d

02% decrease

Explanation

Let us assume a clear baseline value to model the relationship: Salary = 100 .

Initial State: Savings = 10% of 100 = 10. This means the initial expenditure is 100 - 10 = 90.
Apply Adjustments:
New Salary: Increases by 12%, so New Salary = 100 × 1.12 = 112 .
New Expenditure: Increases by 10%, so New Expenditure = 90 × 1.10 = 99 .
Calculate New Savings:

New Savings = New Salary - New Expenditure = 112 - 99 = 13

Calculate Percentage Change:

Change in Savings = 13 - 10/10 × 100\% = 3/10 × 100\% = 30\% increase

When an income allocation equation undergoes compound updates, setting up a fixed baseline value simplifies calculating the net percentage change.

Answer: (b).

Question details

Year

2026

Paper

CSAT

Question

Q23

Section

Quantitative Aptitude

Sub-topic

Percentages

Type

Arithmetic Problem

Difficulty

Easy

Source hint

Income-expenditure links — baseline percentage tracking

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