The following table is a snapshot of the limit order book of stock A.

Bid Ask

Price Size Price Size

80.0 100 82.0 200

79.5 150 84.0 200

78.5 350 85.5 300

75.0 400 86.5 400

72.0 200 87.5 300

a)If a limit buy order of 700 shares at $85 comes in, how many shares will be executed? What is the average price? (4 marks)

b)What is the largest possible tick size of stock A? (2 marks)