The original amount is $50 so half is $50/2 = $<<50/2=25>>25

4 students paid half ($25) for a total of 4*$25 = $<<4*25=100>>100

There are 25-4 = <<25-4=21>>21 students left

21 students paid the full amount ($50) for a total of 21*$50 = $<<21*50=1050>>1050

They were able to gather a total of $100+$1050 = $<<100+1050=1150>>1150

# Answer

1150
<|im_start|>system
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<|im_start|>user
In Mary's class, there are 25 students. Their teacher told them they could pay $50 each to finance a big science project that they and their society would benefit greatly from. They all paid the full amount except for 4 students, who paid half. How much was the class able to gather together?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1150
In Mary's class, there are 25 students. Their teacher told them they could pay $50 each to finance a big science project that they and their society would benefit greatly from. They all paid the full amount except for 4 students, who paid half. How much was the class able to gather together?
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