HEL Sarah decided to purchase four more party hats before she arrived at the party. She could go to Party World like you did or she could go to Party Supplies R Us and purchase party hats there. Party Supplies R Us has the same party hats that you purchased at Party World. The online listing has them listed as 2 hats for $3.20. Where should she go to purchase the party hats? Justify/Explain your answer