Interest = principal × rate × time
if mary deposits $275 in principal at an interest rate of 3.2 percent, how much interest will she earn in one year?

So, if we say as in weeks, 457.6
275 * 0.032 = 8.8, then 8.8 times approx 52, 457.6
for months,
275 * 0.032 = 8.8, then 8.8 * 12 is 105.6
as in daily,
275 * 0.032 = 8.8, then 8.8 * 365 is 3212.
you can use any of these and see which they will concider. if you see at least one of these in that list, that will likely be your answer.