The formula for the amount with simple interest is A = P(1 + rt). Find t if A = 168, P = 150, and r = 0.08.
Plug everything in and you get:
168 = 150 x (1 + 0.08 x t)
You can use algebra to find out what t is:
1.12 = 1 + 0.08 x t
0.12 = 0.08 x t
1.5 = t
