Question 639229
I=prt

Since the word problem did not mention time, it is understood to be 1 year.

interest=112
principal=0.04x
rate=0.05(2x)
time=1 year

0.04x+0.05(2x)=112
100(0.04x+0.05[2x]=112)
4x+10x=11200
14x=11200
x=800

Checking
0.05(2)(800)=80
0.04(800)=32