If you specify a negative scale, Oracle Database rounds the actual data to the specified number of places to the left of the decimal point. For example, specifying (7,-2) means Oracle Database rounds to the nearest hundredths, as shown in Table 26-1.
McCann (2000) found that households in communities with good transit use save an average of about $3,000 annually on transportation costs. Litman (2004) found annual transportation cost savings of about $1,300 per household in cities with well-established rail transit systems compared with cities that lack rail.
Average cost per mile was $0.26 and the average per-vehicle cost was $4,532 Costs reported in 2007 USD Transport Canada Full-Cost Investigation project Analyzes the costs for vehicles by age class in Canada in 2000. Shows how costs and distance traveled decline with vehicle age.