Present Value

An account pays an effective rate of interest of $\displaystyle 3\%$ per year.
Calculate the amount that must be deposited now to have $\displaystyle \pounds 12000$ in $\displaystyle 3$ years.
Give your answer to the nearest penny.

An account pays an effective rate of interest of $\displaystyle 0.4\%$ per month.
Calculate the amount that must be deposited now to have $\displaystyle \pounds 15000$ in $\displaystyle 24$ months.
Give your answer to the nearest penny.

A bond pays an effective rate of interest of $\displaystyle 1.9\%$ per half-year.
Calculate the amount that must be invested now to have $\displaystyle \pounds 7000$ in $\displaystyle 8$ half-years.
Give your answer to the nearest penny.

An investment matured after $\displaystyle 42$ months at $\displaystyle \pounds 9600$.
The account paid an effective rate of interest of $\displaystyle 0.35\%$ per month.
Calculate the amount originally invested.
Give your answer to the nearest penny.