If $30,000 interest is invested in x percent simple annual interest for 10 years, which of the following represents the total amount of interest, in dollars, that will be earned by this investment in the n years?  Choose the correct answer:
A) 5000 x  B) 7000 x  C) 6000 x  D) 3000 x  E) 8000 x
30000*x/100*10 = 3000 x   Answer : 3000 x
<result>D</result>
If $30,000 interest is invested in x percent simple annual interest for 10 years, which of the following represents the total amount of interest, in dollars, that will be earned by this investment in the n years?