I sold 3 units in 563 attempts. How many did I sell per 100 attempts?

I sold 3 units in 563 attempts. How many did I sell per 100 attempts?

Set up a proportion of sales to attempts where s is the number of sales for 100 attempts:
3/563 = s/100

Typing this in our search engine, we get:
s = 0.532 sales