Tom invested part of $8,000 at 3 percent and the rest at 5 percent annual interest for a total return of $340

题目

Tom invested part of $8,000 at 3 percent and the rest at 5 percent annual interest for a total return of $340.

Quantity A

The amount invested at 3%

Quantity B

The amount invested at 5%

选项

The quantity in Column A is greater.

The quantity in Column B is greater.

The two quantities are equal.

The relationship cannot be determined from the information given.

解析

总额：8000美元设 x 美元以3%的利率投资，(8000-x)美元以5%的利率投资。利息 = 340 = (x * 3 *1)/100+ {(8000-x) * 5 * 1}/100 340 = 3x/100 + (40000-5x)/100 340 = 400 - 2x/100 2x = 6000 x = 3000 A的金额 = 3000 B 的金额 = 5000 B 的金额 > A 的金额答案：B

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