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Kriti
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Asked: 2026-10-07T07:10:12+00:00 In:

A person is choosing between two mobile plans. Plan A: ₹50 monthly fee + ₹0.20 per minute of call time. Plan B: ₹30 monthly fee + ₹0.30 per minute of call time. For how many minutes of calling per month is Plan A cheaper than Plan B? For how many minutes is Plan B cheaper? Also find the number of minutes at which both plans cost the same.

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Both plans cost the same at 50 + 0.20m = 30 + 0.30m, giving 0.10m = 20, so m = 200 minutes. Plan B is cheaper for under 200 minutes; Plan A is cheaper for over 200 minutes.

NCERT Solution for Class 9 Ganita Manjari Part 2 chapter 13 question answer

NCERT Solution for Ganita Manjari Part 2 chapter 13 Two Variables, One Line solutions

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    1. Equating both monthly costs gives 50 + 0.20m = 30 + 0.30m, where m is the call duration in minutes. Simplifying yields 0.10m = 20, which gives m = 200 minutes for equal cost. For call durations under 200 minutes, Plan B is cheaper due to its lower fixed base fee. For call durations exceeding 200 minutes, Plan A is cheaper due to its lower per-minute call rate.

       

      For more NCERT Solutions of Class 9 Maths Ganita Manjari Part 2 Chapter 13 Two Variables, One Line Question Answer (2026-27)

      https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-13/

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