Hello!
Marian bought clothes for $56.17. This can be rounded to $56.
Marian bought books for $44.98. This can be rounded to $45.
Marian had a meal at the mall for $21.15. This can be rounded to $21.
Add them up:
56 + 45 + 21 = 122
ANSWER:
The best estimate for the cost of Marian's trip is $122.00.