SOLUTION: A one year investment yields a return of 15%. The cash returned from the investment,including principal and interest is $2070. What is the interest ?

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Question 751840: A one year investment yields a return of 15%. The cash returned from the investment,including principal and interest is $2070. What is the interest ?
Answer by malglu(63) About Me  (Show Source):
You can put this solution on YOUR website!
what we know is that
115% of x (the principle invested) is 2070
115/100 * x = 2070
this becomes x=207000/115
which is 1800
so the principle invested is 1800 and the interest earned is 270