4. Suppose rRP=6%,rM=12%, and bK=1,75. a) Find the required rate of return on stock k(rk) b) If rRF increases to 8% and the slope of the SML, remains constant. How would this affect rM and rK ? c) If rRF remains at 6% but rN falls to 9%. The slope of the SML does not remain constant How would these changes affect xk ? ( 6 points in total)