A. 0.15 Because its making me type twenty characters.
Answer:

Step-by-step explanation:

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Answer:
Step-by-step explanation:
$0.30x=y should be the answer because there is a 30cent fee for every day and x represents how many days it's kept therefore you would add 30 cents for every day it's kept so it's valid to say $0.30x=y becaue the 30 cents times the total of days it's kept = y (the toatl)