National Insurance

National Insurance is calculated on gross pay, before any other deductions.
Monthly National Insurance rates:
Up to $\displaystyle \pounds 1048$: $\displaystyle 0\%$
Between $\displaystyle \pounds 1048$ and $\displaystyle \pounds 4189$: $\displaystyle 8\%$
Above $\displaystyle \pounds 4189$: $\displaystyle 2\%$
An employee has a gross monthly salary of $\displaystyle \pounds 900$.
Calculate her monthly National Insurance contribution.

Monthly National Insurance rates:
Up to $\displaystyle \pounds 1048$: $\displaystyle 0\%$
Between $\displaystyle \pounds 1048$ and $\displaystyle \pounds 4189$: $\displaystyle 8\%$
Above $\displaystyle \pounds 4189$: $\displaystyle 2\%$
An employee has a gross monthly salary of $\displaystyle \pounds 3600$.
Calculate his monthly National Insurance contribution.

Monthly National Insurance rates:
Up to $\displaystyle \pounds 1048$: $\displaystyle 0\%$
Between $\displaystyle \pounds 1048$ and $\displaystyle \pounds 4189$: $\displaystyle 8\%$
Above $\displaystyle \pounds 4189$: $\displaystyle 2\%$
An employee has a gross monthly salary of $\displaystyle \pounds 6200$.
Calculate her monthly National Insurance contribution.

Monthly National Insurance rates:
Up to $\displaystyle \pounds 1048$: $\displaystyle 0\%$
Between $\displaystyle \pounds 1048$ and $\displaystyle \pounds 4189$: $\displaystyle 8\%$
Above $\displaystyle \pounds 4189$: $\displaystyle 2\%$
An employee has a gross annual salary of $\displaystyle \pounds 51600$ and pays $\displaystyle 7\%$ of it into a pension.
Calculate her monthly National Insurance contribution.