245 
1.003
54
1
1395.41 
1.003
54
Parentheses are not needed because exponentiation has precedence over multiplication.
1640.41
1395.41
Note: These solutions are shown for a TI-83 Plus calculator. On some other calculators (including the Windows scientific calculator), you'll need the following keystrokes:
245 
1.003
54
1
1395.41 
1.003 54
1640.41 1395.41