Ifs follows the geometric brownian motion process ds - s dt+os dz what is the process followed by (a) y = 2s, (b) y s 5.

the answer is to check all of them! they all apply well at least i think so!

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

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