To find the total cost of all the items Carlos purchased, we will calculate the cost of each item separately and then add them together.
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Cost of shoes: \[ 1 \text{ pair of shoes} = 19.95 \]
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Cost of neckties: \[ 2 \text{ neckties} = 2 \times 3.95 = 7.90 \]
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Cost of socks: \[ 3 \text{ pairs of socks} = 3 \times 1.25 = 3.75 \]
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Cost of the suit: \[ 1 \text{ suit} = 89.95 \]
Now, let's sum all these costs together: \[ \text{Total cost} = 19.95 + 7.90 + 3.75 + 89.95 \]
Calculating it step-by-step: \[ 19.95 + 7.90 = 27.85 \] \[ 27.85 + 3.75 = 31.60 \] \[ 31.60 + 89.95 = 121.55 \]
Thus, the total cost is: \[ \boxed{121.55} \]