Premise:
"It proved to be worth the effort for Bligh, who received a reward of 1,500 guineas for his effort."
Hypothesis: Bligh happily accepted the 1,500 guineas for his effort, despite all of the hard work.

yes

Premise:
"Several parts of the chateau, including Louis XV's superb Royal Opera, have to be visited on separate guided tours."
Hypothesis: The chateau was originally built on the orders of Louis X.

it is not possible to tell

Premise:
"Duke Cosimo had Vasari design it in 1560 as a series of government offices (hence its name), a mint for the city's florin, and workshops for the Medici's craftsmen."
Hypothesis: Vasari designed a series of buildings for Duke Cosimo in 1560.
yes