10% of 500 is 50, 50*65 = $3,250
Rest of labor would be 450 hours, split between 3 members of the development team, so 450➗3 = 150 hours each.
The head developer makes $45 per hour: 150*45 = $6,750
An assistant makes $30 per hour: 150*30 = $4,500 
Since it’s 2 assistants: 4,500*2 = $9,000
Now you add everything up: 
3250 + 6750 + 9000 = $19,000
The total estimated cost of the project is of $19,000 dollars.