Principal Amount = P = $5000
Interest rate = r = 0.45% = 0.0045
Time in years = t
Compounding periods per year = n = 4
The formula for compound interest is:

Using the given values, we get:

So, comparing the above equation to given equation we can write:
a = 5000b = 1.00113 (Rounded to nearest hundredth-thousandthc = 4t