Mathematics, 27.08.2019 03:00, lisnel

How can you quickly calculate 20 percent of any bill amount? a-round the amount to the nearest $10, remove the zero in the ones place, and add half the resulting amount.
b-round the amount to the nearest $10, remove the zero in the ones place, and halve the resulting amount. c-round the amount to the nearest $10, remove the zero in the ones place, and double the resulting amount.

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How can you quickly calculate 20 percent of any bill amount? a-round the amount to the nearest $10,...