Last year, a property manager bought five identical snow shovels and six identical bags of salt. The total cost of the snow shovels was , before tax, and each bag of salt cost , before tax. ​
This year, the property manager bought two identical snow shovels and four identical bags of salt. The total cost of the snow shovels was , before tax, and the total cost of the bags of salt was , before tax.
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Determine the item with the greatest percent increase in the price from last year to this year. Be sure to include the percent increase of this item to the nearest percent.