Hi

Let x represent base cost and y the charge per 25mi

Question states*** 

  b + (50/25)y = 200

  b + (200/25)y = 245   |Subtracting first equation from second



   b + 8y =  245 

  -b - 2y = -200

       6y = 45

        y = $7.50, the charge per 25mi





b + 7.50*2 = 200

          b = 200 -15

          b = $185

Cost = 185 + 7.50/25mi

 = 185 + 7.50 *450/25 = 185 + 7.50*18 = $320 

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