$15$ Eric is $25$ years old and wishes to receive $$60,000$ after tax, in today's dollars, at the beginning of each of his retirement years. His financial planner suggested a reasonable ATR $($average tax rate$)$ for calculations is $25\%.$ He expects to retire at age $67$ and plans to fund his retirement to age $92.$ Total pension $($employer$,$ CPP$,$ etc$)$ income he expects amounts to $$45,000,$ before tax, in today's dollars. Inflation average over the$-$years is forecast at $3\%$ per annum. Based on the portfolio's weighted average asset allocation, the forecast of nominal returns during retirement, and before retirement, are $7\%$ and $9\%,$ respectively. How much, approximately, does Eric need to save before retirement at the end of each year to meet his retirement goal $($round to the nearest dollar$)?$

$$6,598$

$$8,929$

$$4,877$

Nil

$$7,666$