marsilni

In Q 21, 'Next-five year period' clearly implies 5 time periods. Say it is end of 2006 right now then 5 time periods are - 2007, 2008, 2009, 2010 till end of 2011...

In Q 20, You need to find the rate of growth of EPS, from 4 to 7.
4 is the EPS at the end of period 1. It is your base value. It compounds over next 4 periods to give you a value of 7. Hence you use n = 4 in this question.