P = $300

r = 7%

t = 2

42 is interests. 342 is total

To find interest, you multiply principle, 300, bye rate, 7%, and time 2 years. - if this is what you are asking.

7% needs to be a number - move decimal two spaces to left-.07

300 (.07) (2) = 42

42 is interests. 342 is total