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?
- 5
- 7.5
- 15
- 21.25
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