Write SQL query to solve given problem: Among the donations with a portion using account credits redemption, how many of them are for projects created by teachers working in a public year-round school?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T1.projectid) FROM projects AS T1 INNER JOIN donations AS T2 ON T1.projectid = T2.projectid WHERE T2.payment_included_acct_credit = 't' AND T1.school_year_round = 't'