Art. 2199. Except as provided by law or by stipulation, one is entitled to an adequate compensation only for such pecuniary loss suffered by him as he has duly proved. Such compensation is referred to as actual or compensatory damages.   Article 2200. Indemnification for damages shall comprehend not only the value of the loss suffered, but also that of the profits which the obligee failed to obtain.     In order to give breath to the aforestated provisions on damages of the New Civil Code, they must be transformed into a more tangible and practical mathematical form, so that the purpose of the law to indemnify the employee or his heirs for his death or injury occasioned by his employment, as envisioned by the Article 1711 of the same code may be realized. We deem it best to adopt the formula for loss of earning capacity enunciated in the case of Villa Rey v. Court of Appeals,[23] in computing the amount of actual damages to be awarded to the claimant under Article 1711 of the New Civil Code.   In Villa Rey, the common carrier was made liable for the death of its passenger on board a passenger bus owned and operated by Villa Rey Transit, Inc. going toManila from Lingayen, Pangasinan. While the bus was nearing Sadsaran Bridge in Barrio Sto. Domingo, Minalin, Pampanga, it frontally hit the rear side of bull cart filled with hay and bamboo poles. The protruding end of one bamboo pole, about eight feet long, penetrated through the glass windshield of the bus and hit the face ofPolicarpio Quintos, Jr., who was then sitting at the front row, causing his death.[24]   The obligation of the common carrier to indemnify its passenger or his heirs for injury or death arose from the contract of carriage entered into by the common carrier and the passenger.[25] By the very nature of the obligation which is imbued with public interest,[26] in contract of carriage the carrier assumes the express obligation to transport its passenger to his destination safely and to observe extraordinary diligence with due regard to all the circumstances, and any injury