Bouncing Bunny is a start$-$up manufacturer of toys for children ages $0-5.$ The company's sales and expenses for $2021$ were as follows:

Sales: $$750,250$

Cost of Goods Sold: $$140,250$

Gross Margin $($Profit$)$: $$610,000$

Net Marketing Contribution $($NMC$)$: $$489,500$

Calculate Bouncing Bunny's marketing expenses in $2021.$

Calculate Bouncing Bunny's Marketing Return on Investment $($ROI$)$ for $2021.$

What is Bouncing Bunny's Gross Margin Percentage in $2021?$