Your calculator must need batteries. 500,000,000 * $0.0001 = 50,000.
Logrithmically: 5 at 10 to the 8th power x 1 at 10 to the negative 4th power equals 5 at 10 to the 4th power which is the same as 50,000. You add the powers for multiplication. 8 plus negative 4 to equal 4. Hopefully this didn't burn out the rest of either your calculator or you.