Calculate the value of the expression [(2.5 + 1.5)^2 ÷ 4 of 1/2 × 8 - 1].

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Step 1: Calculate inside the parentheses: 2.5 + 1.5 = 4.0
Step 2: Square the result: 4.0^2 = 16
Step 3: Interpret '4 of 1/2' as 4 × (1/2) = 2
Step 4: Divide the squared result by this value: 16 ÷ 2 = 8
Step 5: Multiply by 8: 8 × 8 = 64
Step 6: Subtract 1: 64 - 1 = 63
Therefore, the value of the expression is 63.

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