Answer:
please mark me as brilliant and answer my questions
That was the total of the 3 t-shirts.
That's the price for the shorts.
So hmmm check the picture below
so, we're looking for dr/dt then at 4:00pm or 4 hours later
now, keep in mind that, the distance "x", is not changing, is constant whilst "y" and "r" are moving, that simply means when taking the derivative, that goes to 0