Given that for selling portable dvd player profit is $32
and for selling dvd recorder profit is 64$.
Let p be the number of portable dvd players sold per a day.
Then total profit on portable dvd players = 32p$
Let r be the number of dvd recorders sold per day.
Then total profit on selling 'r' dvd recorders = 64r$
Hence total profit = 32p+64r
But given that manager's target is to make profit atleast 256$ a day.
That means 32p+64r should be greater than 256.
Hence inequality is 32p+64r ≥ 256.