If brightness increases by 20% and then decreases by 20%, what is the net change?

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Multiple Choice

If brightness increases by 20% and then decreases by 20%, what is the net change?

Explanation:
Percent changes apply to the current value, not the original one. A 20% increase multiplies the value by 1.20, and then a 20% decrease multiplies the new value by 0.80. The overall factor is 1.20 × 0.80 = 0.96, which means you end up at 96% of the starting amount. That’s a net change of −4%. For example, start with 100: increase by 20% → 120, then decrease by 20% → 96. So the overall change is −4%.

Percent changes apply to the current value, not the original one. A 20% increase multiplies the value by 1.20, and then a 20% decrease multiplies the new value by 0.80. The overall factor is 1.20 × 0.80 = 0.96, which means you end up at 96% of the starting amount. That’s a net change of −4%.

For example, start with 100: increase by 20% → 120, then decrease by 20% → 96. So the overall change is −4%.

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