clc 
// Given that
r = 1/3 // Ratio of hardness values of copper and steel
// Sample Problem 2 on page no. 335
printf("\n # PROBLEM 6.2 # \n")
R_Q = (r)^(3/4)
R_t = 1/R_Q
P_R = (1-(1/R_t))*100
printf("\n Percentage change in cutting time when tool is changed from coppper to steel = %d percent(reduction)",P_R)