Вопрос школьника по предмету Математика
Saira invested 1000. part of 8% per annum and the remainder at 9% per annum. after one year, her total interest from these investments was $84. How much did she invest at each rate
Ответ учителя по предмету Математика
х dollars — part of 8% per annum ⇒ 0.08x doll. — income
(1000-x) dollars — part of 8% per annum ⇒ 0.09(1000-x) doll. — income
0.08x — 0.09(1000-x) = 84
0.08x — 90 — 0.09x = 84
0.01x = 6
x = 600
$600 — part of 8% per annum
$400 — part of 9% per annum
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