Find the total cost for a $579 smartphone with 5% sales tax

To find your answer first you must convert 5% into a decimal which will be 0.05. Then you will have to multiply 0.05 by 579 which will give you 28.95. The final step is to add $28. 95 which is the sales tax to $579 which will give you $550.05.
Final cost: $550.05

Volume = the base times the height. i’m not going your work for you, but this is all you need to know.