SELECT COUNT(student_id) , rb.b_id , b_fix_amount , b_fix_amount*(COUNT(student_id)) FROM student_transaction st
JOIN people p ON p.people_id = st.student_id
JOIN receipt r ON r.r_id = st.r_id
JOIN Receipt_Bill rb ON rb.r_id = r.r_id
JOIN bill b ON b.b_id = rb.b_id
WHERE p.o_id = '17' AND r_status_code != 'OPEN'
GROUP BY rb.b_id;
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