Three sentences are given. You need to find if they are grammatically correct or incorrect and mark the answer accordingly.

(P) He made locks and was successful enough at his business to have two helpers.

(Q) Fifteen years ago, Horace served his first and only sentence in a prison library.

(R) Each year he planned carefully just what he would do, stole enough to last for twelve months, and secretly bought the books he loved thorough an agent.