If 0.8 of a number is equal to 0.09 of another number, the ratio of the numbers i	Choose the most appropriate option.
A) 2 : 3  B) 3 : 4  C) 9 : 80  D) 20 : 3  E) none

Rationale: "sol . 0.8 a = 0.09 b â ‡ ” a / b = 0.09 / 0.8 = 9 / 80 = . â ˆ ´ a : b = 9 : 80 . answer c"
Answer: C