NY -- Standard&Poor's CreditWire 8/5/96 -- In a comparison of calculations on the cost of the Mexican bank bailout in the Aug. 7 issue of CreditWeek, Standard&Poor's continues to estimate the present value cost of the bailout at 12% of Mexico's 1995 GDP, whereas the latest government figure puts the cost at 7.2% of 1996 GDP. Standard&Poor's first published the 12% estimate on June 19, 1995. The report follows the government's invitation to review its own models for estimating the bailout's future cost. In a report written by directors John Chambers and Victor Herrera Espinosa, Standard&Poor's states that it "does not doubt the integrity and rigor of the [the government's] calculations. The