2. A car is initially traveling at 23 m/s when the driver steps down hard on the gas pedal resulting in an acceleration of 2.0 m/s2. How fast will the car be moving 3.0 seconds later?

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form