Bob runs a bicycle shop near the beach and recently was notified about some changes in pricing for his business. The cost of rent was increasing from $964/month to $1544/month for the summer months. Additionally, the cost of replacement tires was going up from $12/tire to $16/tire; and tires are replaced every 2000km which varies with usage as a result of weather. What is the percentage increase in Bob's monthly fixed operating costs during the summer months?