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How much money in total would be paid by the 1st 150 student

How much money in total would be paid by the 1st 150 student-example-1

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113.25 because the middle ground of 1 - 150 students is 75 and then 1+150=151  2+149+151 but instead of doing that again and again just multiply the lowest number and the highest number by the middle ground 
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