Advanced Math practice question

Answer: 720

Each hour multiplies by 1.2: 500 × 1.2² = 500 × 1.44 = 720.

Common wrong answers

If you answered 600

600 is after ONE hour.

If you answered 700

700 adds 20% of 500 twice (linear growth); the second 20% is taken of 600, not 500.

If you answered 1200

1,200 multiplies by 1.2 × 2 instead of 1.2².

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