Central high schools (chs) is hosting a fundraising event. - the venue, decorations, and disc jockey cost $1,400. -the venue can hold at most 300 students -tickets cost $20 for a chs student and $30 for a non-chs student let s represent the number of chs student tickets sold, and let n represent the number of non-chs student tickets sold. if the school wants to earn money on this event, which system of inequalities represents the numbers of tickets that should be sold?

a) 20s + 30n ≤ 1400, s + n ≤ 300
b) 20s + 30n ≥ 1400, s + n ≤ 300
c) 20s + 30n ≥ 1400, s + n ≥ 300
d) 20s + 30n ≤ 1400, s + n ≥ 300