C++ error on line 28, Could you please tell me what is wrong with it? I'm new to C++?

//Ch3AppE03.cpp


//Calculates and displays a commission amount


//Created/revised by 1102640 on 1-19-08





#include %26lt;iostream%26gt;





First person that helps correct my error will get the ten points.


using std::cout;


using std::cin;


using std::endl;





int main()


{








//declare variables


double sales = 0.0;


double rate = 0.0;


double commission = 0.0;





//enter input items





cout %26lt;%26lt; "Enter the sales: ";


cin %26gt;%26gt; sales;


cout %26lt;%26lt; "Enter the commission rate: ";


cin %26gt;%26gt; rate;





//calculate commission


commission = sales * commission rate;








//display commission


cout %26lt;%26lt; "Your commission is: " %26lt;%26lt; commission %26lt;%26lt; endl;


return 0;


} //end of main function





I know the error is on the calcaulation line (28) but dunno what is wrong with it.

C++ error on line 28, Could you please tell me what is wrong with it? I'm new to C++?
commission = sales * commission rate;





You probably want:


commission = sales * rate;
Reply:what country are you from?
Reply:Variable commission rate is not declared!!


it should be


commission = sales * rate;