Answer:
Either $200 or $80 depending on the question.
Step-by-step explanation:
1. Curtis paid <em>$80</em>
2. The vet charged <em>$40 </em>for the medicine. <em> x + $40 = $120</em>
3. If he owes the vet <em>$120 </em> and he paid <em>$80 </em>then his total bill is <em>$200.</em>
HOWEVER, if the question is asking what ammount he initially started with it would be <em>$80</em> because that's all he has paid.