Construct a two by two table using the data given above. Be

A cohort study of smoking and bladder cancer was conducted in a small island population. There were a total of 1000 people on the island. Four hundred were smokers and 600 were not. Fifty of the smokers developed bladder cancer.  Ten of the non-smokers developed bladder cancer.

Construct a two by two table using the data given above. Be sure to label the cells and margins.
Which measure of comparison would you use to describe the relative effect of smoking on the risk of bladder cancer?
What is the formula for this measure of comparison?
Calculate this measure of comparison using the given data.
State the meaning of your answer in one sentence.