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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169*10/100 = 16.9
0.5 cents (half a cent) is equal is to 10% of 5 cents.
10 cents.
10 cents
Subtracting 10 percent from 40 dollars gives 40 x (1 - (10/100)) = 36 dollars.