SOLUTION: An investor has $8000 invested at 9% and wishes to invest some addtional money at 16% in order to return at least 12% on total investment. What is the least amount of money that sh

Question 218154: An investor has $8000 invested at 9% and wishes to invest some addtional money at 16% in order to return at least 12% on total investment. What is the least amount of money that should be invested?
Answer by alicealc(293) (Show Source): You can put this solution on YOUR website!
let the additional money = m
8000*9/100 + m*16/100 = (8000+m)*12/100
72000/100 + 16m/100 = 96000/100 + 12m/100
720 + 16m/100 = 960 + 12m/100
16m/100 - 12m/100 = 960 - 720
4m/100 = 240
4m = 240*100
4m = 24000
m = 24000/4
m = 6000
so,the least amount of additional money should be invested is $6000

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