To find out how much the product of \(0.2\) and \(15.4\) is less than \(10\), we start by calculating the product:
\[ 0.2 \times 15.4 = 3.08 \]
Next, we need to determine how much \(3.08\) is less than \(10\):
\[ 10 - 3.08 = 6.92 \]
Therefore, the product of \(0.2\) and \(15.4\) is \(6.92\) less than \(10\).