The cost rating factor CRF of a metals is calculated using the following equation; CRF=(c*P)/D C= cost per unit mass (N/ton) P= density(kg/m^3) D= design stress(N/mm^2) Develop a PHP program to...

The cost rating factor CRF of a metals is calculated using the following equation;

CRF=(c*P)/D

C= cost per unit mass (N/ton)

P= density(kg/m^3)

D= design stress(N/mm^2)

Develop a PHP program to compute the cost rating factor of the following metals;