You are planning for your retirement after 25 years from now, which is expected to last for 30 years. There are two investment options available to you: 1) Progressive Investment Fund, earning a nominal APR of 29.7% (compounded daily), 2) Worldwide Stock Fund, earning a nominal APR of 30.12% (compounded monthly). Assume that the risk of the two investments is the same. What is your monthly saving in real terms if you are spending $10,000 per month now and you want to maintain the same lifestyle after retirement? Assume the inflation rate (expressed as monthly compounded APR) is 6%.