Question

英文数学题，请大家帮忙，谢谢！

An investor placed her money in a venture paying 7% interest . if she had another $1500 , she would have been able to invest her money at 10% and gain an additional $255 in annual interest . how much did she invest ? 请写出步骤！谢谢

Answer 1

你好

题意如下：一个投资者将她的钱投资到7%利润的商机里。如果她还有1500美元，她会以10%的利率投资并每年多得到255美元。现在她投资了多少钱？

解法如下：设她现在投资了x美元
则10%(x+1500)-7%x=255
3%x=255-10%*1500=255-150=105
因此x=10500÷3=3500美元
现在她投资了3500美元
希望对你有帮助
望采纳~

Answer 2

$225/10%=$2250
$2250-$1500=$750
应该是这样吧 :P