Answer:
Step-by-step explanation:
You don't say whether this is compound interest or simple interest.
I will assume it's compounding that interests you.
The appropriate formula is
A = P(1 + r)^t, where r is the interest rate as a decimal fraction, t is the time in years, and P is the original amount. Thus:
A = $1000·(1 + 0.05)^t, or A = $1000·(1.05)^t
Please note: There were apparently possible answer choices. Next time, please be sure to list such choices. Thank you.
3d = 255
d = 85
d85 = x
d is the number of days, x is the amount of earnings.
5(85) = x
425 = x
2:5
4:10
6:15
Because they give you thee base ratio, you can see that 5 x 2 = 10
so 2 x 2 = 10 which makes an equivalent ratio.