Suppose that furniture production encompasses the following stages: stage 1: trees are sold to lumber company. $1,800 stage 2: lumber is sold to furniture company. $4,000 stage 3: furniture company sells furniture to retail store. $8,200 stage 4: furniture store sells furniture to consumer. $12,500 instructions: enter your responses rounded to the nearest whole number. a. what is the value added at each stage? stage 1: $ stage 2: $ stage 3: $ stage 4: $ b. how much does this output contribute to gdp? $ c. how much would the output contribute to gdp if the furniture sold to the retail store were imported from thailand?