First, you multiply 10 and 3 for the children.
10(3)•3
Then, you multiply 30 and 3 together.
30•3
Which equals:
90
After that, you add 2 and 1.
2+1
Then, you multiply 3 and 3.50.
3•3.50
Which equals:
10.50
Add 90 and 10.50
90+10.50
Which equals
$100.50
Becky earns 100.50 dollars at the end of the night.