Answer: If everyone pays for their own ticket then each person paid 180 pesos per person. If four of them volunteered to pay the total, then each of the four people paid 450 pesos.
Explanation:
If each person paid for their own ticket then you would divide 1,800 (total pesos amount) by 10 (total amount of people). This will equal 180, therefore each person will pay 180 pesos.
If 4 people volunteer to pay the total, then you will divide 1,800 (total amount of pesos) by 4 (total amount of people paying). This equals 450, therefore each person would pay 450 pesos.
I hope this helps you :)