A company normally sells its product for $20 per unit. However, the selling price has fallen to $15 per unit. This company's current inventory consists of 200 units purchased at $16 per unit. Replacement cost has now fallen to $13 per unit.
Install Roof Shingles Cost. Typical cost to have roofing shingles installed in San Antonio, TX is around $80 - $100 (per square, asphalt). Roof Replacement Cost. Typical cost to have roofing replaced in San Antonio, TX is around $5,760 (24'x45').
In the Houston Texas metro area, roofing companies and contractors will charge anywhere from $195 â $295 per square to replace most roofs (this is for a standard 1-2 story with a roof pitch of 5/12 or less).t is necessary then to add 15%-20% (depending on how simple or cut-up the roof is) to the 2,500 sq. ft. total for waste, starter and ridge (2,500 x 15% = 375). Now add those two numbers together, 375 sq. ft. + 2,500 = 2,875 sq. ft. for the grand total square footage of roofing area for this roof.