Question: how much is 1 yug?
Answer: 4000 + 400 + 400 = 4800 divine years (= 1728000 human years) = 1 Satya Yuga. 3000 + 300 + 300 = 3600 divine years (= 1296000 human years) = 1 Treta Yuga. 2000 + 200 + 200 = 2400 divine years (= 864000 human years) = 1 Dvapara Yuga. 1000 + 100 + 100 = 1200 divine years (= 432000 human years) = 1 Kali Yuga.