Question

英文数学题，请大家帮忙，谢谢！

an investor has $7500 invested at one rate and $6200 invested at a different rate . if the second investment is at a rate 2% lower than the first , find the rate for each investment if his annual interest is $698.请大家写步骤！谢谢！

Answer 1

解：设第二个投资利率为x则有
6200*x+7500*（x+2%）=698
解得x=4% 4%+2%=6%
第一个投资利率为6%，。。4%
if the second investment is at a rate 2% lower than the first

翻译：如果第二投资是2％的速率低于第一，应该是列成：（x+2%）
希望对你有帮助！

Answer 2

设第二个利率是x，则有7500(x+0.02)+6200x=698
得x=0.04，即4%
所以第一个利率是6%