( 17.28 /? ) / (3.6 x 0.2) = 200

Let (17.28 / y) / (3.6 x 0.2) = 200
Then,17.28 / y = 200 x 3.6 x 0.2
∴ y = 17.28 / (200 x 3.6 x 0.2)
= 1728 / 200 x 36 x 2
= 0.12.