In 2020, the population of village A was 25% more than that of village B and the population of village C was 20% more than that of B. In 2021, the population of A increased by 20%, that of B decreased by 10% and that of C decreased by 5%. If the total population of A, B and C in 2021 was 56,640, then what was the population of C in 2020?