2. apex autos acquired a new car from a manufacturer for an invoice price of $22,450.00, and it set
the sticker price with a 12% markup. a customer came into apex autos, traded in her old car, and
purchased this new car. she paid the sticker price minus the amount of money she was given for her
old car, which was $7750.00. apex autos then marked up the customer's old car by 20% and sold it
to somebody else. let's analyze how well apex autos made out on this deal.

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?