Answer:
a
Step-by-step explanation:
Well, you lost the original $100 and then you gained back $70 but gave away $70 worth of merchandise, so it evens out and you lost $100 in total
Answer:
p=1
Step-by-step explanation:

Answer:
None of those.
Step-by-step explanation:
Unless there is more to each problem, none of those are non-proportional. :(