On Dec 29, 2017, the shares of Google, IBM, and GE closed at $1,046, $153, and $17.45 respectively. The closing prices of the three stocks on Jan 26, 2018 were $1,176, $167, and $16.13, respectively. None of the three companies paid dividends during this period. The market values of the three companies at the end of 2017 were $730, $142, and $151 billion dollars. Calculate the return of a value-weighted index consisting of these three stocks during this period.