On a shopping trip, your sister spends $50 for a pair of jeans, $12 for a pack of socks, and $215 on a pair of tennis shoes. Using the Associative Property of Addition, write the total amount spent on this trip in two different ways.

I need help finding the answer.

50 + (12 + 215)

(12 + 50) + 215

http://www.coolmath.com/prealgebra/06-properties/03-properties-associative-addition-01