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Let's solve each part of the question:

### Part (a)
Rafael bought 19 pounds of sugar for $12. To find the cost per pound, we divide the total cost by the total weight:
\[
\frac{12}{19} = 0.63
\]
So, Rafael paid **$0.63 per pound**.

### Part (b)
At Smith's Bike Rentals, it costs $11 to rent a bike for 3 hours. To find the cost per hour, we divide the total cost by the number of hours:
\[
\frac{11}{3} = 3.67
\]
Thus, the cost per hour of bike use is **$3.67**.

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Would you like further details or have any questions about this solution?

Here are some related questions:
1. How do you calculate unit price for different quantities?
2. Why is rounding important in practical financial calculations?
3. What other examples use a similar cost per unit calculation?
4. How does this concept apply to average rates in other contexts, like speed?
5. Can unit cost affect consumer decision-making in daily purchases?

**Tip:** For similar problems, remember that dividing the total cost by the total quantity gives you the cost per unit.

Rafael bought 19 pounds of sugar for $12. How many dollars did he pay per pound of sugar? At Smith's Bike Rentals, it costs $11 to rent a bike for 3 hours. How many dollars does it cost per hour of bike use?

Learn how to calculate unit rates by determining the cost per pound of sugar and the cost per hour for bike rental. This problem covers unit rate calculations and is suitable for students in Grades 6-8.

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