#### Explanation:

Change $1$ hour and $25$ minutes to the correct notation:

$\text{1 hour and 25 minutes = 60 minutes + 25 minutes = 85 minutes}$

Do

$\frac{85}{60} = \frac{x}{100}$

So

$x = \frac{85 \cdot 100}{60}$

$x = \text{141.67 minutes" -> "1.42 hours}$

Add the total number of hours together:

$\text{1.75 hours + 2.33 hours + 1.42 hours = 5.5 hours}$

Doug earns $10.50 per hour, so for $5.5$hours, multiply $10.50$by $5.5$: $10.50 * 5.5 = \$57.75