Sparrow Inc. is a sugar manufacturing company. Its production budget for the year 2016 is 1,280 tons. For the production of 1,280 tons of sugar, Sparrow will require 5,000 metric tons (TMT) of sugarcane. It estimates its beginning balance of sugarcane to be 500 TMT and its ending balance of sugarcane to be 900 TMT. What is the estimated amount of sugarcane to be purchased to meet the production budget?