Heres exactly how much youd have now if your investments had grown at a 4%, 6%, or 8% rate of return over the past decade, according to CNBC calculations.

• If you invested $500 a month for 10 years and earned a 4% rate of return, youd have $73,625 today.
• If you invested $500 a month for 10 years and earned a 6% rate of return, youd have $81,940 today.
• If you invested $500 a month for 10 years and earned an 8% rate of return, youd have $91,473 today.

how this calculations done ?