To determine Johnny's weekly earnings, follow these steps:
1. Identify Johnny's Hourly Wage: First, note that Johnny earns [tex]$45.50 per hour.
2. Identify the Total Number of Hours Worked in a Week: Johnny works 40 hours per week.
3. Calculate Weekly Earnings: Multiply Johnny's hourly wage by the total number of hours he works in a week.
\[
\text{Weekly Earnings} = \text{Hourly Wage} \times \text{Hours Worked Per Week}
\]
With the given values:
\[
\text{Weekly Earnings} = \$[/tex]45.50 \times 40
\]
4. Compute the Result:
[tex]\[
\$45.50 \times 40 = \$1820.00
\][/tex]
Therefore, Johnny earns $1820.00 per week.