The first battle of Tarain was fought

What will come in the place of question mark (?) in the given expression?

?² = 3945 ÷ 5 + 774 ÷ 6 – 77 

(3984 ÷ 24) x (5862 ÷ 40) = ?

14% of 700 + 15% of 900 + 10% of 160 = ?

15 × 18 + 25 × 12 + 30 × 24 = ?% of 1720

1231 + 1312 + 2113 – 3211 = ?

3.2% of 500 × 2.4% of ? = 288

What will come in the place of question mark (?) in the given expression?

28 × 15 + 48% of ? = 780

What will come in the place of question mark (?) in the given expression?

1020 ÷ 51 × 5 + 540 of 25% - 10 = ?² 

[{(3 × 54 × 21)/63} + 6] / 6 = √?