what is the logic and the answer

Question

here is one question my friend sent me. What can be the last two numbers' answers and can you also tell the logic, thanks

4072=1 3489=3 6517=1 9682=4 7678=3 1020=2 9345=? 9807=?

Answer 1

$9345 = 1$ and $9807 = 4$. One counts the number of circles made by the numerals. So a 0, 6 and 9 count as 1 and an 8 counts as 2.