Question 1207743
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Here is an informal solution to compare with the formal algebraic solution shown by the other tutor.<br>
Observe that 18% is {{{red(2/3)}}} of the way from 16% to 19%.
That means that, to average a return of 18%, {{{red(2/3)}}} of the money must be loaned at the higher rate.
So she can lend 1/3 of the money at the lower 16% rate.<br>
ANSWER: 1/3 of $1,000,000, which is $333,333.33<br>