An astronaut drops a feather from 3.6 m above the surface of the moon.
If the acceleration of gravity on the moon
is 1.62 m/s^2, how long does it take the feather
to reach the surface?

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

answer is slate

hope this