In management accounting what is manufacturing overhead is and how to allocate it to repair jobs accurately.?

How to track expenses such as direct labour and direct materials on specific repair jobs?

If there is a repair service centre, can I change my billing style and start at a flat rate of $30 per repair then adding on $40 per hour?

Will this pricing strategy help me cover two major expenses like electronics replacement parts and labour? If I track hours by quarters (15-minute increments) would it be sufficient for billing purposes?

Is there a mathematical formula which could be entered into the store's for the above billing purpose?

Can we make a graphical representation of how the above change might evolve if there is an increase of $30 flat rate and decrease the $40 hourly rate?

Are the fixed expenses too high and if customers are unwilling to pay that much to repair a TV, should I close my business? Is It often better to buy a new TV and scrap the old one. Will eliminating the TV repair service/department would actually make the business more profitable?

Please suggest which factors might be relevant to the decision and why.

What is variance analysis?

How to determine variances and what constitutes a favourable or unfavourable variance?

How variances can be caused by discrepancy in sales volume or efficiency?

I want help in providingrecommendations which are well supported by quantitative and qualitative analysis which ties to the case facts.