Brianna deposit $680.00 into savings account that pays a simple interest rate of 1.29% how much will she earn after 3 years

Here's the equation for one year:
0.0129(680) + 680
But because it is 3 years:
3(0.0129(680)) + 680
0.0387(680) + 680
We can make it simpler:
1.0387(680)
Multiply:
706.316
We can round up:
She will have $706.32, and earn $26.32

1+1=22×1=22-1=11-1=1duh