Gemini Enterprise Ltd undertakes three different jobs: A, B, and C. All of them require the use of a special machine and also the use of computer. The computer is hired and the hire charges work out...

Gemini Enterprise Ltd undertakes three different jobs: A, B, and C. All of them require the use of a special machine and also the use of computer. The computer is hired and the hire charges work out to be `4,20,000 per annum. The expenses regarding the machine are estimated as follows:

You are required to compute the machine-hour rate (a) for the firm as a whole for the month when the computer was used and when the computer was not used, (b) for the individual jobs: A,B and C.