To find out how many weeks it will take Samuel to save $300, we first need to determine how much more money he needs to save.
Starting with the total amount he wants to save:
\[ 300 - 65.25 = 234.75 \]
Now, we know Samuel saves $15.50 per week. To find out how many weeks it will take to reach $234.75, we can divide the amount he needs by his weekly savings:
\[ \frac{234.75}{15.50} \approx 15.16 \]
Rounding this to the nearest whole number gives us approximately 15 weeks.
Thus, it will take Samuel about 15 weeks to save an additional $300.