Final answer:
After calculating the cost of coffee and rice Luigi bought, which totals $43.68, and subtracting this from the $50 bill he paid with, we find that Luigi's change is $6.32.
Step-by-step explanation:
Luigi made a purchase of coffee and rice, which requires us to calculate the total cost and determine the change received from a $50 bill. To find the total cost, we multiply the weight of each item by its respective price per pound.
The total cost for the coffee is 2 ½ pounds times $15 per pound, which equals $37.50. The total cost for the rice is 9 ½ pounds times $0.65 per pound, which equals $6.175. Adding both amounts gives us a total of $43.675 or $43.68 when rounded to the nearest cent.
Next, we subtract the total cost from the $50 bill to determine Luigi's change. The change Luigi received is $50 minus $43.68, which equals $6.32.