Information
Paulo's father bought 8 pizzas and 12 bottles of juice.
Each pizza cost $9 and each bottle of juice cost $2.
Paulo's father paid using a $100 bill.
Steps
1.) First, multiply the cost of each pizza by the total number of pizzas Paulo's father bought.
$9 (cost per pizza) x 8 (pizzas bought) = $72 (total cost of 8 pizzas)
2.) Next, multiple the cost of each bottle of juice by the total number of bottles of juices Paulo's father bought.
$2 (cost per bottle of juice) x 12 (bottles of juice bought) = $24 (total cost of 12 bottles of juice)
3.) Add the total cost of the two together so:
$72 (total cost of 8 pizzas) + $24 (total cost of 12 bottles of juice) = $96 (total cost of 8 pizzas and 12 bottles of juice)
4.) Paulo's father paid using a $100 bill, so subtract 100 from the total cost of the two items:
$100 (bill) - $96 (total cost of 8 pizzas and 12 bottles of juice) = $4 (in change)
Conclusion
Paulo's father received $4 in change.