Which of the following is not correct? Rule 72 is a convenient way to help estimate how long an investment will become triple at a specific discount rate, by dividing 72 with the discount rate. Effective annual rate is the rate that produces the same ending value under annual compounding Perpetuity has a payment that lasts forever, therefore one would say its future is infinitely large. Effective annual rate (EAR) is used for comparing time analysis with different compounding periods Which of the following state,ent regarding stand alone and portfolio risk is not correct? In stand alone investment the rate of return distribution of a less risky investment is less likely a wide spread than a riskier investment. The risk portfolio decreases as more and more investments are randomly added If the correlation coefficient of two stand alone investment in a combined portfolio is positive and smaller than 1 there exist some risk exist some risk reduction effect If the correlation coefficient of two stand alone investments in a combined portfolio is -1, it could form a risk of the portfolio could be increased