Hi - please show working..

Aco Ltd mined diamonds at a cost of FC 1,000,000 and sold them to Beako for FC 2,500,000. Beako distributed the diamonds to its customers and received FC 4,000,000. If the national VAT is 20%, how much tax did Beako pay? A) FC 200,000 B) FC 500,000 C) FC 300,000 D) FC 800,000