im in my first year of financial math and im so lost on this chapter 6 question about trade discounts, cash discounts, markup and markdown any help and insight would be appreciated.

What total amount must be remitted if the following invoices, all with terms 4/10,2/30, n/60, are paid on May 10? $850 less 20% and 10% dated March 21 $960 less 30% and 162/3% dated April 10 $1040 less 331/3%,25%, and 5% dated April 30