Which one of the following processes is the main task

? = 20% of 1200 + 256

(2197)^1/3 + (18)² − 121 = ? − 69 × 5

26 ² – 13% of 400 + (529 ÷ 23 ² ) = ? ² 

If (i) P is taller than Q, (ii) R is shorter than P, (iii) S is taller than T but shorter than Q, then who among them is the tallest?

(5/8 of 480 - 30% of 420)² ÷ (√81 + 25% of 320) = ?

24.5% of 400 + 528 of 12.5 ÷ 11

?² + 114 - 48 ÷ 2 × 5 = 163

Calculate the simplified result of the following expression: 12 × 18 ÷ 3 + 36 of 3² ÷ 3

45% of 1020 + ?% of 960 = 747