answer:
0.0123456789 (1/81)
Explanation:
if the quotient of the two numbers is 1, they are the same. start by divided 5/9 by 2
you get 5/18 for both numbers.
40% = 0.4 x 5/18 = 1/9
1/9 x 1/9 = 0.0123456789 (i wish i was joking, but that is the number. it is 1/81)