6학년 딸아이 수학 숙제 도와주다 스트레스 받습니다. 공식도 다 잊어버려 가물거리고....

An overnight package delivery service charged $16 for every package safely delivered but it would pay a penalty of $48 for every package delivered damaged. If it recieved $9,152 for a delivery of 600 packages, how many package were safely delivered?