Suppose you have an equal weighted index that consists of only 3 stocks. Today, one increased to $11 from yesterday's close of $10. Another rose to $6.50 from yesterday's close of $5. The third fell to $18 from yesterday's close of $20. In percentage terms what happened to that index today? a) It fell by 10% Ob) It fell by 20% c) It rose by 10% O d) It rose by 20% Im