The pressure gauge on an air tank reads 5 X 10⁶ N/m² If the tank is a cylinder with a 5 cm radius, how much force does the air exert on the base of the tank?

O 3.9 × 10⁴ N
O 6.4 × 10⁸ N
O 1.6 × 10⁶ N
O 7.9 × 10⁷