(9.95) 2 x (2.01) 3 = 2 x (?) 2

(9.95)² x (2.01)³ = 2 x (?)²
Here, 9.95 is Approximated to 10, 2.01 is approximate to 2 because calculating the square or cubes of whole number is much easier than to calculate the square or cube of decimal numbers
2 x (?) ² = ( 10)² x (2)³ = 100 x 8 = 800
⇒ (?)² = 400
∴ ? =20