3x+12=5x-21
-5x -5x
-2x + 12 = -21
-12 -12
-2x=-33
x = 16.5
Simple Interest formula is :
, where I = Amount of interest, P= Principal amount, r = rate of interest in decimal and t = time duration in year.
Given in the question that, P = $800 and r =
% = 4.75% = 0.0475
<u>a.</u> For t =
year ....

So, Jada will receive $19 interest at the end of 1/2 year.
<u>b.</u> For t = 1 year ....

So, Jada will receive $38 interest at the end of 1 year.
The answer is going to be 2