Free GMAT Practice Question

Ines harvests $h$ kilograms of pears, every kilogram of which costs her $c$ dollars to grow. She keeps $r$ kilograms for her own market stall, where $r$ is less than $h$, and sells all the remaining kilograms to a wholesaler at $p$ dollars per kilogram. In terms of $c$, $h$, $p$ and $r$, by how much does the money Ines receives from the wholesaler exceed the cost of growing the whole harvest?