1) on average, donna's cafe has 42 customers, which represents 20% of the total approved occupancy by the fire department.
a) according to the fire department's occupancy approval, what percentage of the cafe is still available for customers?
b)according to the fire department's occupancy approval, how many seats are still available for customers?

Given that Donna's Cafe has 42 customers representing 20% of the total approved occupancy by the fire department.

a.) According to the fire department's occupancy approval, the percentage of the cafe still available for customers is 100% - 20% = 80%

b.) Given that 42 customers represent 20% of the total approved occupancy by the fire department.
Let the total approved occupancy be x, then 20% of x is 42
i.e.

i.e. the total approved occupancy is 210.

According to the fire department, the number of seats that are still available for customers is given by