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10% of 1.69¢ = 10/100 × 1.69¢ = 0.169¢

→ 10% off is 1.69¢ - 0.169¢ = 1.521¢

Alternatively:

10% off ≡ 100% - 10% = 90% of the original number

→ 10% off 1.69¢ = 90% of 1.69¢ = 90/100 × 1.69¢ = 1.521¢

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8y ago

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