The function model will be -
Divide the cost by the number of pupils to split it, and you'll get the function C=1200 / n.
1200/N ≤ 7.50
1200 / 7.50 ≤ N
N ≥ 1200/7.5
N ≥ 160
To keep the price per kid to no more than $7.50, there must be more than 160 participants.
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