Question

Find the growth rate (percent growth) for a relationship with the equation y=30(2^x)

Answer 1

your growth rate is 100% ... i e it keeps doubling, as shown by the powers of 2

Your formula is a shortened version of

Future amount = Present amount*(1.00 + rate aka 1.00 in your case)^x aka t for time

and of course the second 1.00 = 100% when talking growth rate. (in a unit of time)