In an RC circuit, what happens to the charging time

(5³ + 480 ÷ 4)% of 20 = ?% of 70

2/5 of 3/4 of 7/9 of 7200 = ?

(512) ^(2/3) × √64 ÷ (512) ^(1/3) = (64) ^(?/2) ÷ (2)⁶ 

40% of 220 × 15 ÷ 20 = ?

{(52² – 48² ) ÷ (27 + 73)} × 35 = ?% of 17

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

55% of 1600 – (18 × 50) = ? ÷ 16 

Simplify the following expression:

144 ÷ [84 - 3 × {75% of 80 - 40% of 90}]

10 * 15 + 30% of 150 + 80% of 200 = ?

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