Same facts as Question $16$ above, expect that in exchange for using the clippers, Bob pays Alan $$50.$ What result?

Bob was obliged to use extraordinary care with the property, and will have to pay.

Bob was obliged to use ordinary care, and may or may not have to pay depending upon whether he was acting as a reasonably prudent person would have acted when the damage to the clippers occurred.

Bob was obliged to use slight care, and will not have to pay because he was not grossly negligent.

Bob and Alan did not form a bailment; rather, Alan made a gift to Bob.