You are responsible for buying the hamburger rolls for an upcoming picnic each bag of rolls cost $1.30 and contains 8 rolls you need to buy a total of 64 rolls how much money will it cost for the rolls

$1.30 times eight equals $10.40. You need eight packages at total cost of $10.40.

64 / 8 = 8 
1.3 * 8 = $10.40

since there are 8 buns in a bag and you need 64 total buns. You do the total number of buns needed (64) divided by the number of buns in each bag (8). Which comes out to 8 bags of buns needed. Then each bag of 8 buns costs $1.30. So, you do 1.3 times 8 which equals $10.40.