If a 5 percent rise in the price of sushi increases the quantity of soy sauce demanded

Question:

If a 5 percent rise in the price of sushi increases the quantity of soy sauce demanded by 2 percent and decreases the quantity of sushi demanded by 1 percent, calculate the
a. Price elasticity of demand for sushi.
b. Cross elasticity of demand for soy sauce with respect to the price of sushi.