To calculate the total amount of money Sammy spent, we first need to find the total cost of the T-shirts and the jeans, and then add the sales tax.
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Cost of T-shirts:
- He bought 3 T-shirts at $15.75 each.
- Total cost of T-shirts = 3 * $15.75 = $47.25
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Cost of jeans:
- He bought 2 pairs of jeans at $28.79 each.
- Total cost of jeans = 2 * $28.79 = $57.58
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Total cost before tax:
- Total cost = Total cost of T-shirts + Total cost of jeans
- Total cost = $47.25 + $57.58 = $104.83
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Total amount spent including sales tax:
- Total amount spent = Total cost + Sales tax
- Total amount spent = $104.83 + $5.24 = $110.07
So, the total amount of money Sammy spent is $110.07.
Thus, the answer is $110.07.