Which statement is a statement of verifiable fact and which express an inference?

Question

(a) Half of the mangoes I bought are unripe and sour.
(b) The vendor cheated me. He sold me unripe and sour mangoes.
(c) I paid more than I should. Half of the mangoes I bought are unripe and sour.

Answer 1

a) fact
b) inference
c) either, he might have paid fair market value for unripe and sour

Answer 2

a and c are verifiable fact after all the mangoes are eaten.

b is an inference in the sense that we don't know whether the vendor actually told the buyer that the mangoes are ripe (and if so, why the buyer could not judge for him/herself?)

Answer 3

(a) is a verifiable fact

(b) is an inference

(c) is an inference

Fact: Let the buyer beware!

Answer 4

(a) is verifiable fact.
(b) and (c) are inferential statements. It's a 'therefore' kinda statement.