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You invested $11,000 in two accounts paying 8% and 9% annual interest, respectively. If the total interest earned for the year was $980, how much was invested at each rate?
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You invested $11,000 in two accounts paying 8% and 9% annual interest, respectively. If the total interest earned for the year was $980, how much was invested at each rate?

User Franck Dernoncourt
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x * 8/100 * 1 + 9/100 * (11,000 - x) = 980
0.08 x + 0.09 (11000 - x) = 980 Now solve for x which is the amount invested at 8%

0.08x + 990 - 0.09x = 980
- 0.01x = 980 - 990 = -10
x = -10 / -0.01
x = 1000

So he invest 1000 in 8% and 10000 at 9%

User Jason Kresowaty
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