Percentages are easy to determine from decimals.  To change a decimal to a percentage, simply multiply by 100.  This is the same as moving the decimal point two placeholders to the right.  For example, the decimal 0.054 written as a percentage is

\[0.054 = 5.4 \%.\]

To change $\large \frac{1,200,000}{317,000,000}$ to a percentage, perhaps try first to determine what this fraction is equivalent to as a decimal.  Then, use the rule above to convert from a decimal to a percentage.

Tyler