A sinking fund involves a series of uniform deposits of $R made into an account at the end of each interest period.
A sinking fund is to be created, with the same deposit at the end of each of ten years, to yield the following progress payments for a transport construction project:
Year 10 $10 million
Year 11 $10 million
Year 12 $10 million
Year 13 $30 million
What is the annual deposit required, if interest rate is 10%?