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Multiplying a number by 3 1/2 does not necessarily increase its value so the question is based on nonsense.
Increase its value if the exponent is greater than 1
The increase is 88 - 2 or 86. The percentage increase is 100 times this number divided by the original value, or 100(86/2) or 4300 %.
% increase = |original value - new value| /original value * 100%
Wavlue after increase