80% can be thought of as 80% of one. Percents also refer to numbers out of 100, thus, our decimal can be calculated by taking 80/100. This would result in 8/10 after simplifying, which is equivalent to 0.8.

80% = 80/100 = 8/10 = "eight tenths," or 0.8

To express a percentage as a decimal, imagine a decimal at the end of the percentage \(\displaystyle \left ( 32.\% \right )\). Move the decimal over two places to the left, and you have the decimal expression of a percentage, \(\displaystyle .32\)

The word percent, or per cent, means of every one hundred, so 88% can be expressed:

\(\displaystyle 88\%=\frac{88}{100}=\frac{2\cdot 44}{4\cdot 50}=\frac{44}{50} =\frac{2\cdot 22}{2\cdot 25}=\frac{22}{25}\)

To find 40% of $80, you must turn 40% into a decimal.

\(\displaystyle 40\%=\frac{40}{100}=0.4\)

\(\displaystyle 0.4\times80=32\)

The decimal in 74% is located between the 4 and the '%'. So think of 74% as 74.0%.  Then move that decimal point two digits to the left and erase the '%' so that it is written as 0.74

When reading \(\displaystyle \small \frac{4}{10}\) aloud it reads \(\displaystyle 4\) out of \(\displaystyle \small 10\), or "four tenths." This "four tenths" as a decimal is literally written \(\displaystyle \small 0.40\). 

We could also use the other term given to find our answer. Decimals are found from percentages by moving the decimal point two places to the left. Given \(\displaystyle \small 40\%\), the decimal moved results in \(\displaystyle \small 0.40\). 

When reading \(\displaystyle \frac{6}{10}\) aloud it reads \(\displaystyle 6\) out of \(\displaystyle 10\), or "six tenths." This "six tenths" as a decimal is literally written \(\displaystyle 0.60\).

We could also use the other term given to find our answer. Decimals are found from percentages by moving the decimal point two places to the left. Given \(\displaystyle 60\%\), the decimal moved results in \(\displaystyle 0.600\) or \(\displaystyle 0.6\). 

\(\displaystyle \small 1.18 -0.30 = 0.88\). To convert \(\displaystyle \small .88\) to a percentage, the decimal is moved two places to the right, resulting in \(\displaystyle \small 88\%\).

Alternatively, we would have converted the decimals to percetages from the beginnging. \(\displaystyle \small 118\% - 30\% = 88\%\), to do this we started with the decimal numbers given and moved the decimal point to the right two places.  

Given the percentage \(\displaystyle \small 43.29\%\), the decimal point must be moved two decimal places to the left, resulting in \(\displaystyle 0.4329.\) 

This decimal can further be written as fraction, 

\(\displaystyle \small \frac{4329}{10,000}\)which when reduced \(\displaystyle \small = \frac{43.29}{100}\).

Since percentages represent part of a whole, or part of 100, \(\displaystyle 43.29\) is the final answer. 

First we must solve the problem: 

\(\displaystyle \small \small 100\% - 38\% - 12\% = 50\%\).

Now to convert the percentage to a decimal all we do is move the decimal point two decimal places to the left. In this case, we began with \(\displaystyle \small 50.0\). After moving the decimal point we end up with \(\displaystyle \small 0.500\) as our result.