Final answer:
To find the percent of sandwiches that were pastrami, divide the number of pastrami sandwiches by the total number of sandwiches sold and multiply by 100.
Step-by-step explanation:
To find the percent of sandwiches that were pastrami, divide the number of pastrami sandwiches by the total number of sandwiches sold and multiply by 100. In this case, there were 36 pastrami sandwiches out of 90 sandwiches sold. So, the equation is:
% of pastrami sandwiches = (36/90) * 100 = 40%