How can you quickly calculate 20 percent of any bill amount?

1 answer:

4 0

There are several ways in solving quick the 20% of any bill. One of those ways is by getting first the 10% of the amount then will later on be multiplied by two. Another one is by simply dividing the total bill amount by 5, which also 20% of the total bill amount. Hope this helps.

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Answer:

(a)

1 sig: 0.005

2 sig: 0.0048

3 sig: 0.00482

(b)

1 sig: 50

2 sig: 50.

3 sig: 50.0

(c)

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2 sig: 0.00098

3 sig: 0.000981

Step-by-step explanation:

Significant Figures Rules:

Any non-zero digit is significant.
Any trailing zeros after the decimal is significant.
Any zeros between 2 significant digits are significant.
Zeroes before significant numbers in the decimal place are NOT significant; they are placeholders.

(a)

0.004816 - the zeros are placeholders, so they do not count as sig figs.

(b)

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(c)

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