Respuesta :

Answer: 18%

Step-by-step explanation:

To solve this, we just need to divide 9 by 50.

If we double 50 we get 100, making the division a lot easier

So it would be 18/100, because we need to double the 9 as well

18/100 = 0.18 or 18%

He left a 18% tip at the restaurant