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     EduGorilla 
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    Total expenses of a boarding house are partly fixed and partly varying linearly with the number of boarders. The average expense per boarder is $700 when there are 25 boarders and it is $600 when there are 50 boarders. What is the average expense (in $) per boarder when there are 100 boarders?

    Options :-

    1. 700
    2. 550
    3. 570
    4. 580
    5. 650
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