For the past two years, a property manager buys snow shovels and bags of salt. Last year, the manager bought 5 snow shovels and 6 bags of salt. The total for the snow shovels was $172.50 before tax and each bag of salt cost $6.20 before tax. This year, the manager bought 2 snow shovel and 4 bags of salt. The total for the snow shovels was $70.38, before tax, and the bags of salt cost $26.04 before tax. Determine the item with the greatest percent increase in price from last year to this year. What was the percent increase?