Answer :
80 x 90/100 = 72
Therefore there were 72 milkshakes with whipped cream that were sold.
Therefore there were 72 milkshakes with whipped cream that were sold.
you need to convert the percentage into a decimal to get your answer...
80 x .9 = 72
hope that helps :)
80 x .9 = 72
hope that helps :)