To calculate the cost of the trampoline including tax, you first need to calculate the sales tax amount and then add it to the original price.
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Calculate the sales tax: \[ \text{Sales Tax} = \text{Cost} \times \text{Tax Rate} \] \[ \text{Sales Tax} = 220 \times 0.12 = 26.40 \]
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Add the sales tax to the original cost: \[ \text{Total Cost} = \text{Cost} + \text{Sales Tax} \] \[ \text{Total Cost} = 220 + 26.40 = 246.40 \]
Therefore, the cost of the trampoline including tax is $246.40.