The gravitational attraction between two objects varies directly as the product of their masses and inversely as the square of the distance between them. If the force of attraction between two spheres, each with a mass of 1 g that are 1centimeter apart is 6.66 x 10-8 dynes. Determine the force of attraction between two spheres with masses of 2 gram and 4 gram that are 4 centimeter apart.