c$)$ Write a EXCEL program which uses the classical Runge$-$Kutta $4^{th}$ order method to solve the following ODEs. Find K$1,$ K$2,$ K$3$ and K$4.$ Do $10$ steps. Tabulate your steps.

$y^{\text{'}}=y+y^2,y(0)=0\mathrm{.}2,h=0\mathrm{.}1$

$y^{\text{'}}=(1-x^{-1})y,y(1)=1,h=0\mathrm{.}1$