Mrs. Zapata paid a total of $8.17 to mail three packages. She paid $2.77 to mail the first package. She paid $3 to mail the second package. How much did Mrs. Zapata pay to mail the third package?

The list shows the number of trees Isaiah planted in three years.

He planted 521 trees in the first year.

He planted 387 trees in the second year.

He planted 438 trees in the third year.

Isaiah wants to plant a total of 2,000 trees. How many more trees does Isaiah need to plant?