Answer:
C.
Step-by-step explanation:
Answer:
The third option.
Step-by-step explanation:

Hence the 3rd option.
He gave away 8 so he would have 12/20 which is 60% left :)
To find the future value the formula is
A=p e^rt
A future value?
P present value 8906.54
R interest rate 0.06
T time 9 years
E constant
A=8,906.54×e^(0.06×9)
A=15,283.68
To find the interest earned the formula is
I=A-p
I=15,283.68−8,906.54
I=6,377.14
20: 1,2,4,5,10,20
28: 1,2,4,7,14,28