Find the constant term in the expansion of: (10x^3-1/2x^2)^5

I think this is supposed to be :

( 10x^3 - 1 / (2x^2) ) ^5

The constant term is :

- C(5, 3) * (10x^3)^2 * ( 1 / (2x^2))^3 =

-10 * (100 x^6) * ( 1 / (8x^6) ) =

- [10 * 100 / 8[ * (x^6 / x^6 ) =

- 125