Given the following equation and parameters, please calculate ROI (eg "50" for 50%) for a slated Software Process improvement(SPI) implementing better Change Management Tracking processes.

Return On Investment (ROI) = (Benefits - Costs ) / costs * 100%

Parameters:

Reduction in Defects/Year: 100 delects

Average Cost to Resolve a Defect: $5000

Decreased Effort To Maintain 20%

Historical Maintenance $200,000/year

Training on New Process/Developer: $10000/developer

Process Creation $15,000

Developers:10 Increased Change Management Costs (Opportunity) $20,000/yr