At a grocery store, Rick bought 4 loaves of bread and 3 gallons of milk for $20. Danny bought 6 loaves of bread and 2 gallons of milk for $25. Identify the cost of a loaf of bread and a gallon of milk.
loaf of bread: $2.50; gallon of milk: $3.00
loaf of bread: $3.50; gallon of milk: $2.00
loaf of bread: $2.50; gallon of milk: $2.00
loaf of bread: $3.50; gallon of milk: $3.00