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With a calculator this can be done by doing 420*1.11.

Without a calculator, it is also very easy, and is done by finding 10% of 420 which is 420/10 which is 42. So 42 = 10% of 420. And 1% of 420 is 4.2. 1%+10%+100% = 4.2+42+420 =466.2.

466.2Very basic.:)
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14y ago

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