The coffee variety Arabica yields about 750 kg of coffee beans per hectare while Robusta yields about 1200 kg/hectare. Suppose that a plantation has a hectares of Arabica and r hectares of Robusta.! On August 14, 2003, the world market price of coffee was $1.42/kg for Arabica and $0.73/kg for Robusta. Write an equation relating a and r if the plantation produces coffee worth $1,500,000. 1.42 . 750 + 0.73 . 1200 1500000 http://www.da.gov.ph/tips/coffee.html, accessed October 6, 2007. 2http://www.cafedirect.co.uk/about/gold_prices.php, accessed August 14, 2003