whatever% of anything is just (whatever/100) * anything.
so the summer camp entry is $110.40, and there's a taxation of 6.5% of that, well, what is 6.5% of 110.40? well, is just (6.5/100) * 110.40, namely 7.176.
so the total cost, price and tax is 110.40 + 7.176.
Summer camp: $110.40
Sales tax: 6.5%
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Multiply $110.40 by 6.5% (0.065).
110.40 * 0.065 = 7.176
Add 7.176 (tax) to 110.40.
110.40 + 7.176 = 117.58
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Summer camp (including tax): $117.58
