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Original charge on a capacitor whose energy rises by a given percent when charge increases by 3 C

The same question, asked 2 times: 12 May 2024 S2*, 21 Apr 2025 S2. Every wording below, oldest first.

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  1. Question 1

    12 May 2024 S2

    49
    If the charge on the capacitor is increased by 3 coulomb, the energy stored in it increases by 44%. The original charge on the capacitor is

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  2. Question 2

    21 Apr 2025 S2

    26
    If the charge on the capacitor is increased by 3C, the energy stored in it increases by 21%21\%. The original charge on the capacitor is

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