Write a user defined function named as Lnfunc. It will calculate the value of p with respect to the following equations where t is a number and a = 30. p(t)= [In(1/t)et if t > a In(14) if t sa Then, in the command window, calculate the values of p for t=5 and t=7 by typing Lnfunc(5) and Lnfunc(7).