What is the value of the square root of:

[{(100 of 0.9 × 0.8 − 7 × 1.2 ÷ 0.2 + 5 × 4 − 3 × 2)} ÷ 10 + 1.85]

6.25

[{(100 of 0.9 × 0.8 – 7 × 1.2 ÷ 0.2 + 5 × 4 – 3 × 2)} ÷ 10 + 1.85]

= [{(90 × 0.8 – 7 × 1.2 ÷ 0.2 + 5 × 4 – 3 × 2)} ÷ 10 + 1.85]

= [{(90 × 0.8 – 7 × 6 + 5 × 4 – 3 × 2)} ÷ 10 + 1.85]

= [{(72 – 42 + 20 – 6)} ÷ 10 + 1.85]

= [{(92 – 48)} ÷ 10 + 1.85]

= [44 ÷ 10 + 1.85]

= [4.4 + 1.85] = 6.25