Murabaḥah is a term for a sales contract where the buyer and seller agree on the markup, the ratio between the cost of a good or service and what?
Markup (business) Markup is the ratio between the cost of a good or service and its selling price. It is expressed as a percentage over the cost. A markup is added onto the total cost incurred by the producer of a good or service in order to cover the costs of doing business and create a profit. The total cost reflects the total amount of both fixed and variable expenses to produce and distribute a product. Markup can be expressed as a fixed amount or as a percentage of the total cost or selling price. Retail markup is commonly calculated as the difference between wholesale price and retail price, as a percentage of wholesale. Other methods are also used.
Grand Mufti The Grand Mufti (Arabic: مفتي عام‎ ‎ "muftī ʿām  ", "general expounder" or كبير المفتين "kabīr al-muftīn  ", "the great of expounders") is the highest official of religious law in a Sunni or Ibadi Muslim country. The Grand Mufti issues legal opinions and edicts, fatwas, and interpretations of Islamic jurisprudence for private clients or to assist judges in deciding cases. The collected opinions of the Grand Mufti serve as a valuable source of information on the practical application of Islamic law as opposed to its abstract formulation. The Grand Mufti's fatāwā (plural of "fatwā") are not binding precedents in areas of civil laws regulating marriage, divorce, and inheritance. In criminal courts, the Grand Mufti's recommendations are generally not binding either.