Question

how did thuyet know that 1% of 80 is 0.8? how can you determine the decimal point in that?

Explanation:

Step1: Recall percentage formula

To find \( n\% \) of a number \( x \), we use the formula \( \frac{n}{100} \times x \). Here, \( n = 1 \) and \( x = 80 \).

Step2: Substitute values into formula

Substitute \( n = 1 \) and \( x = 80 \) into the formula: \( \frac{1}{100} \times 80 \).

Step3: Calculate the result

\( \frac{1}{100} \times 80=\frac{80}{100} = 0.8 \).

Answer:

By using the percentage calculation formula \( \frac{n}{100} \times x \) (where \( n = 1 \) and \( x = 80 \)), we find that \( 1\% \) of \( 80 \) is \( 0.8 \), which matches the given statement. So the statement is correct.