Question $3$ of $6$

Three invoices for the amounts of $$35,500,$$$25,000,$ and $$41,000$ were received on July $3,2014,$ August $2,2014,$ and August $25,2014,$ respectively. If the payment terms are $\frac{3}{7},\frac{2}{30},\frac{n}{60},$ calculate the amount that must be paid on September $1,2014$ to settle all three invoices.