human
Roxanne bought 2 cups of lemonade for $2 each and 2 sandwiches for $2.50 each. How much change must she get from a $20 bill?
assistant
How much does 2 cups of lemonade cost? ** Two cups of lemonade amount to $2 x 2 = $<<2*2=4>>4.
How much does 2 sandwiches cost? ** Two sandwiches amount to $2.50 x 2 = $<<2.5*2=5>>5.
How much did Roxanne have to pay? ** So, the total amount that Roxanne had to pay was $4 + $5 = $<<4+5=9>>9.
How much change must Roxanne get? ** Thus, her change must be $20 - $9 = $<<20-9=11>>11.
#### 11