Explanation:
first- multiply $13.80 with 2 which will give u 27.60
( this will give u the price of 24 hamburgers )
second- divide $13.80 with 12 which will give u $1.15 ( that will give u the price of each hamburger so since we want to know the price of 32 hambugers and we have already calculated 24 so we are left with 8 ham burgers)
third- multiply 8 with $ 1.15 which will give u $ 9.20
( now we got all the price then we add )
fourth- $27.60 + $9.20 = $ 36.80