Economics is about making efficient uses of scarce resources. This is about learning how people in their daily lives make decisions of allocating scarce amount of resources - â¦ time and budget-they possess, to meet their numerous desires. At occasions many of you may have wished you had more income and more time.
1 A well-maintained residential marble floor might start to show some signs of wear in 2-4 years, and will need to be professionally honed and polished at cost of about $2.50-$3 a square foot, with a minimum charge of $400-$500 for a single grind and polish. Professional installation of marble flooring starts around $9-$20 a square foot (materials and labor), or $900-$2,000 for installing a marble tile floor in a 100-square-foot foyer.
Polishing belts are normally sold in quantities of ten per box. Depending on which type of belt is purchased, the average cost can range from $2.50 to $4.00 per belt. Ordinarily, a polishing belt that has been maintained properly can be used to polish fifty crankshafts or more.y using the appropriate belt and operation, polishing should remove no more than .0002â of material. It is important to note that some less experienced engine builders attempt to cleanup their crankshaftâs journals with a 200 grit belt.