Calculate the return$-$on$-$investment for this scenario. A large automobile dealership decides to provide a one$-$day onsite training for its sales associates to help them be effective in explaining the features and benefits of extended warranties. The dealership sells $3,500$ automobiles a year. Before the training, only $25\%$ of customers purchased an extended warranty. After the training, $30\%$ of customers are purchasing the extended warranty. Extended warranties sell for $$200.$ The costs of the training are:

Trainer: $$2,500$

Travel expenses for trainer: $$1,200$

Curriculum: $$500$

Refreshments and lunch: $$350$