<PRE><B>Question 187319</B>
Colin invested $13,000, part at 15% and part at 10%. If the total interest at the end of the year is $1,900, how much did he invest at each rate? Place your answers in the two blanks. Enter the amounts in whole dollars only. 
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interest + interest = interest
0.15x + 0.10(13000-x) = 1900
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Multiply thru by 100 to get:
15x + 10*13000 - 10x = 190000
5x = 60000
x = $12,000 (amt. invested at 15%)
13000-12000 = $1,000 (amt. invested at 10%)
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Cheers,
Stan H.</PRE>