Logical Reasoning Percentages, Ratios & Unit Calculations BUMHS 2025
PMDC Verified Question 10 of 19
If a person earns Rs. 1000 in the first week and their income doubles each week, how much will they earn in the 4th week?
A
Rs. 4000
B
Rs. 8000
C
Rs. 3000
D
Rs. 16000
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Rs. 8000
Concept: Doubling Progression.

Formula: \(a_n = a_1 \times 2^{n-1}\)

Solution:

  • Week 1 = Rs. 1000


  • Week 4 = \(1000 \times 2^3 = 1000 \times 8 = \text{Rs. } 8000\).


Why other options are incorrect:

Option D: Calculates Week 5 earnings.

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