i encountered the following question when practising for the medschool entrance exam in italy. i was trying to solve it for hours but i don't know how to get the right answer. hope somebody can help. thanks in advance.

**Sodium chloride (relative molecular mass = 58.5) has a solubility of 36.0 g per 100 g of water.**

The density of the solution is 1.13 g/ml. Which of the following calculations would give the solubility in moles per litre?

A 36.0 x 1000 x 1.13/(58.5 x 136)

B 36.0 x 1000/(58.5 x 1.13)

C 36.0 x 10 x 1.13/58.5

D 36.0 x 10 x 1.13/(58.5 x 136)

E 36.0 x 10/58.5

The density of the solution is 1.13 g/ml. Which of the following calculations would give the solubility in moles per litre?

A 36.0 x 1000 x 1.13/(58.5 x 136)

B 36.0 x 1000/(58.5 x 1.13)

C 36.0 x 10 x 1.13/58.5

D 36.0 x 10 x 1.13/(58.5 x 136)

E 36.0 x 10/58.5

i know that A is the right answer. but why?