A store sells two types of nuts: peanuts and cashews. Peanuts sell for $p$ dollars per pound, and cashews sell for $c$ dollars per pound. A customer buys 3 pounds of peanuts and 2 pounds of cashews for a total of $25.50. Another customer buys 5 pounds of peanuts and 4 pounds of cashews for a total of $48.50. Which system of equations can be used to determine the values of $p$ and $c$?