medium · GMAT Quantitative Reasoning
A logistics company charges a base fee of f dollars plus a rate of d dollars per kilometer for each delivery. For a 15-kilometer delivery, the total charge is 85. For a delivery of x kilometers, the company applies a 20% surcharge to the sum of the base fee and the mileage charge.
If the surcharged total for a 25-kilometer delivery is 156, what is the value of f + d?
- 24
- 17.5
- 20.5
- 22
- 26.5
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