Falmer Ltd makes product Mull. In January 2023, when the budget was first prepared, standard labour cost per hour was 8.33 and it should require one hour to make each unit of Mull. In February 2023, staff received a 3% pay rise and labour time required per unit increased by 10%. Falmer has just produced 2,000 units of product Mull in April, using 2,200 hours at a labour cost of 18,700. What is the planning labour rate variance?