Question 666127
Let d be the number DVDs per day.

Then let E be the expenses where E= 1500 + .80d

And let R be the revenue where R = 1.59d.

Find d such that R > E.

So  1.59d > 1500+.80d

Subtract .80d on both sides:

.79d > 1500

d > 1898.734

We can only sell an integer amount of DVDs, so we must sell 1899 DVDs a day to make a profit.