Aproject to build a new bridge seems to be going very well since the project is well ahead of schedule and costs seem to be running very low. a major milestone has been reached where the first two activities have been totally completed and the third activity is 65% complete. the planners were expecting to be only54% through the third activity at this time. the first activity involves prepping the site for the bridge. it was expected that this would cost $1,440,000 and it was done for only $1,320,000. the second activity was the pouring of concrete for the bridge. this was expected to cost $10,520,000 but was actually done for $9,020,000. the third and final activity is the actual construction of the bridge superstructure. this was expected to cost a total of $8,520,000. to date, they have spent $5,020,000 on the superstructure. calculate the schedule variance?