Write a system of equations to describe the situation below, solve using elimination, and fill in the blanks.
A boy scout troop is selling Christmas trees at a local tree lot. In the morning, they sold 4 Douglas Fir trees and 15 Noble Fir trees, earning a total of $862. In the afternoon, they sold 4 Douglas Fir trees and 23 Noble Fir trees, earning a total of $1,262. How much does each type of tree cost?
