Give the starting value a, the growth factor b, and the growth rate r if q = abt = a(1 + r)t . write r as a percent.
q=34.3(0.788)t
a.
a = 29.94
b = 0.788
r = 78.8%
c.
a = 34.3
b = 0.788
r = 21.2%
b.
a = 29.94
b = 0.212
r = 78.8%
d.
a = 34.3
b = 0.212
r = 11.2%

Given are the following

Formula Q = abt = a (1+r)t
a = 34.3 b = 0.788 

Find the r as a percent

Since b is a growth factor and to get it is that you need to add the growth rate plus 1. To get the growth rate, you need to get the difference of the growth factor and 1.

1 - 0.788 = 0.212 x 100 

21.2% 

So the correct answer is letter c which is a= 34.3 b= 0.788 r = 21.2%