Step-by-step please

old NBA'S Tony Tony Garcia and Robert Armstrong are both a newly minted three year plans to invest 1000 per month into his 401(k) beginning next month Robert interest to invest 2000 per month but he does not plan to begin investing until 10 years after Tony begins investing both Tony and Robert will retire at age 67 and the 401(k) plan averages a 15% annual richer how much more money will Tony have over Robert a retirement? Rand to 2 de amals