Answer: They earned $720 from the T-shirts.
Step-by-step explanation:
Given : The number of T-shirts sold was 3 times the number of hats.
The profit was $5 for each T-shirt sold and $2.50 for each hat sold.
The students raised $840 for the charity.
Let x denotes the number of T-shirts sold and y denotes the number of hats sold.
then, we will have the given system :-
[tex]5x+2.50y=840\\x=3y[/tex]
It is also given that they used the system below to analyze their success and found the solution to be (144, 48).
It means x= 144
It means the number of t-shirt sold = 144
The amount they earn from t-shirt = [tex]144\times5=\$720[/tex]
Hence, they earn $720 from the T-shirts.
