medium · SAT Math

A catering company charges a flat base fee plus a fixed additional fee for each guest. For an event with 40 guests, the total cost is $850. For an event with 60 guests, the total cost is $1,150.

Based on these two events, what is the increase in total cost for each additional guest?

  1. 5
  2. 7.5
  3. 15
  4. 21.25

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