If brightness increases by 10% and then increases by another 10%, what is the net change?

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Multiple Choice

If brightness increases by 10% and then increases by another 10%, what is the net change?

Explanation:
Percent changes compound when applied successively. A 10% increase multiplies the value by 1.10. Doing that again on the new amount multiplies by another 1.10, giving 1.10 × 1.10 = 1.21 of the original. That means a 21% net increase. The other numbers come from treating the second increase as if it were based on the original amount (+20%), or from miscounting the second increase (+19% or just +10%).

Percent changes compound when applied successively. A 10% increase multiplies the value by 1.10. Doing that again on the new amount multiplies by another 1.10, giving 1.10 × 1.10 = 1.21 of the original. That means a 21% net increase. The other numbers come from treating the second increase as if it were based on the original amount (+20%), or from miscounting the second increase (+19% or just +10%).

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