Correct: 10% of 50 = 5, 10% of 40 = 4, 10% of 12 = 1.2, 10% of 15 = 1.5, 5% of 50 = 2.5, 5% of 40 = 2, 5% of 12 = 0.6, 20% of 50 = 10, 20% of 40 = 8, 20% of 15 = 3, 10% of 80 = 8, 10% of 12.30 = 1.23, 5% of 8 = 0.4, 20% of 80 = 16, 10% of 52 = 5.2, 5% of 80 = 4, Incorrect: 10% of 50 = 10, 10% of 40 = 8, 10% of 12 = 6, 10% of 15 = 0.15, 5% of 50 = 10, 5% of 40 = 4, 5% of 12 = 6, 20% of 50 = 20, 20% of 40 = 4, 20% of 15 = 6, 10% of 80 = 4, 10% of 12.30 = 123.0, 5% of 8 = 4, 20% of 80 = 8, 10% of 52 = 0.52, 5% of 80 = 2,

Mental Math: Tax & Tip

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