Mr. Rao buus a computer, a printer and a scanner for $2543. The computer costs $1502 more than the printer. The printer costs $123 more than the scanner. How much does Mrs. Rao pay for the computer?

1) total $ = 2543

2) x - > printer y-> computer z - > scanner

3) y = x + 1502

4) x = z + 123 - > x - 123 = z

5) 2543 = (x + 1502) + (x - 123) + x

6) 2543 = x + 1502 + x - 123 + x

7) 2543 = 3x + 1379

8) 2543 - 1379 = 3x

9) x = 388$

10) y = x + 1502

11) y = 1890$

computer costs 1890$