I think it is p-(p*0.25^4)
Stolyar p*0.25^4 is the discount price not the resulting price. Am I correct?
Stoylar is correct and youare wrong. You are applying the 25% discount to each resulting discount when you need to apply it to the price.
Former Senior Instructor, Manhattan GMAT and VeritasPrep
Vice President, Midtown NYC Investment Bank, Structured Finance IT
MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993