Question $5$:

A mortgage $($loan$)$ of $25,000$ is to be repaid in $20$ equal annual instalments at an interest rate of $10\%.$ How much must each instalment be$?$

Question $6$:

A factory costs $$400,000.$ It will produce an inflow after operating costs of $$100,000$ in year $1,$ $$200,000$ in year $2,$ and $$300,000$ in year $3.$ The opportunity cost of capital is $12\%.$ Calculate the NPV$.$

Question $7$:

A bond will pay $6\mathrm{.}75$ per $100$ face value per annum in perpetuity, the first payment being in three years$$ time. If the cost of debt is $7\%,$ what is the current market value of the bond?