500
At the school store, Ricardo bought 4 pencils and 6 erasers and spent $2.60. Annabelle bought 4 pencils and 10 erasers and spent $3.80. Solve the system of equations to determine the cost of 1 pencil and the cost of 1 eraser.
What is $0.30 for an eraser and $0.20 for a pencil?