Hi there, the thing that I'm mainly stuck with is to get the equation from the question. Here is the question -
An investor received $1400 interest per annum from a sum of money, with part of it invested at 10% and the remainder at 7% simple interest. She dound that is she interchanged the amounts she had invested she could increase her return by $90 per annum. Calculate the total amount she had invested.
(This question is in the topc of Simultaneous Equations but in the worded problem section. The answer to this question is $17,000 but the thing is I don't know the equation and how to get it).
Thanks.
An investor received $1400 interest per annum from a sum of money, with part of it invested at 10% and the remainder at 7% simple interest. She dound that is she interchanged the amounts she had invested she could increase her return by $90 per annum. Calculate the total amount she had invested.
(This question is in the topc of Simultaneous Equations but in the worded problem section. The answer to this question is $17,000 but the thing is I don't know the equation and how to get it).
Thanks.