Answered

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A bank loaned out ​$18,000​, part of it at the rate of 9% per year and the rest at 19% per year. If the interest received in one year totaled ​$​3000, how much was loaned at 9%
How much of the ​$18,000 did the bank loan out at 9%?

Sagot :

x * 0.09 + (18000-x)*0.19= 3000
x*(-0.1) + 3420 = 3000
x = -420/(-0.1)
x = 4200

The bank loaned out $4,200 at 9%
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