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A company expects to retire an existing machine at the end of $1993$ and will replace it with new machine for the same task at an estimated cost of Php $60,000\mathrm{.}00.$ The old machine is expected to be sold for Php $5,000\mathrm{.}00$ when it is replaced. To provide for replacement, the company intends to deposit the following amounts in an account earning interest at $8\%$ compounded quarterly:

Php $20,000\mathrm{.}00$ at the end of $1990$

Php $15,000\mathrm{.}00$ at the end of $1991$

Php $10,000\mathrm{.}00$ at the end of $1992$

What additional amount is needed at the end of $1993$ to purchase the new machine?