Answer:
self-perception theory
Step-by-step explanation:
While Festinger's self-perception theory assumes the existence of an internal impetus to maintain consistency between different perceptions, on the contrary, self-perception theory wants to interpret the attitude of a subject. by deducing from the subject's own behavior without having to assume a motivation to minimize the conflict between perceptions.
In this case, he does arithmeti everyday with $2 for each problem he solves correctly, I conclude that he like doing that. But now, only $1 for each problem solving so no more motivation, he losses his interest.
