I need help with this equation if you could help that would be greatly appreciated

Question

A farmer knows that of every  eggs his chickens lay, only  will be marketable. If his chickens lay  eggs in a week, how many of them will be marketable?

Answer 1

50-----45

100----90

200----180

400----360

800----720

2400---2160

OR

marketable eggs = ⁴⁵/₅₀ of 2400

=> ⁴⁵/₅₀ x ²⁴⁰⁰/₁

=> ⁹/₁₀ x ²⁴⁰⁰/₁

=> 9 x 240

= 2160