Beth purchased her car for $18,400. Three years later the car was worth $15,200. Find the percent change in the value of her car.​

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!