1)
This statement is false as it doesn't proves markets are inefficient. This is because keyloggs is just a part of S&P 500 index and the index incudes many companies from many sectors. It is possible that on a particular day, a company is making losses while other is in profits. One company can beat the market return on a particular day but it cannot constantly beat the market on a daily basis that is the point.
2 ) this can be calculated on a financial calculator with following key strokes :-
FV = $1045
PV = - 1131.25
Pmt = 90
N = 25
Compute I/Y = 6.65%
I hope this helps
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